Questions and Answers of Optics

A Babinet compensator is positioned at 45° between crossed linear polarizers and is being illuminated with sodium light. When a thin sheet of mica (indices 1.599 and 1.594) is placed on the
Is it possible for a beam to consist of two orthogonal incoherent P-states and not be natural light? Explain. How might you arrange to have such a beam?
The specific rotatory power for sucrose dissolved in water at 20°C (λ0 = 589.3 nm) is +66.45° per 10 cm of path traversed through a solution containing 1 g of active substance (sugar) per cm3 of
On examining a piece of stressed photoelastic material between crossed linear polarizers, we would see a set of colored bands (isochromatics) and, superimposed on these, a set of dark bands
Consider a Kerr cell whose plates are separated by a distance d. Let „“ be the effective length of those plates (slightly different from the actual length because of fringing of the field).
Compute the half-wave voltage for a longitudinal Pockels cell made of ADA (ammonium dihydrogen arsenate) at λ0 ≈ 550 nm, where r63 = 5.5 × 10-12 and no = 1.58.
The Jones vector for an arbitrary linearly polarized state at an angle Î¸ with respect to the horizontal isProve that this matrix is in agreement with the one in Table 8.5 for a P-state
Find a Jones vector EËœ2 representing a polarization state orthogonal toSketch both of these. Ё - 2i -2i
Two incoherent lightbeams represented by (1, 1, 0, 0) and (3, 0, 0, 3) are superimposed.(a) Describe in detail the polarization states of each of these.(b) Determine the resulting Stokes parameters
Show by direct calculation, using Mueller matrices, that a unitirradiance beam of natural light passing through a vertical linear polarizer is converted into a vertical P-state. Determine its
Confirm that the matrixwill serve as a Mueller matrix for a quarter-wave plate with its fast axis at +45°. Shine linear light polarized at 45° through it. What happens? What emerges when a
The Mueller matrixin which C = cos 2a and S = sin 2a, represents an arbitrary wave plate having a retardance Δφ and a fast axis at an angle a measured with respect to the horizontal. Use it to
Beginning with the Mueller matrix for an arbitrary retarder provided in the previous problem, show that it agrees with the matrix in Table 8.6 for a quarter-wave plate with a vertical fast axis.Table
Derive the Mueller matrix for a quarter-wave plate with its fast axis at -45°. Check that this matrix effectively cancels the one in Problem 8.81, so that a beam passing through the two wave
Pass a beam of horizontally polarized linear light through each one of the 14 Î»-plates in the two previous questions and describe the states of the emerging light. Explain which field
Use Table 8.6 to derive a Mueller matrix for a half-wave plate having a vertical fast axis. Utilize your result to convert an R-state into an L-state. Verify that the same wave plate will convert an
Construct one possible Mueller matrix for a right-circular polarizer made out of a linear polarizer and a quarter-wave plate. Such a device is obviously an in homogeneous two-element train and will
If the Pockels cell modulator shown in Fig. 8.65 is illuminated by light of irradiance Ii, it will transmit a beam of irradiance It such that It= Iisin2(Î”Ï†/2).Make a plot of
Construct a Jones matrix for an isotropic plate of absorbing material having an amplitude transmission coefficient of t. It might sometimes be desirable to keep track of the phase, since even if t =
Construct a Mueller matrix for an isotropic plate of absorbing material having an amplitude transmission coefficient of t. What Mueller matrix will completely depolarize any wave without affecting
Keeping Eq. (8.33) in mind, write an expression for the randomly polarized flux density component (In) of a partially polarized beam in terms of the Stokes parameters. To check your result, add a
An optical filter can be described by a Jones matrixObtain the form of the emerging light for each of the following incident beams:(a) A plane polarized beam polarized at angle Î¸ to the
Two linear optical filters have Jones matricesandIdentify these filters. 1 e¯im/4 1 A2 pİT/4
A liquid cell containing an optically active sugar solution has a Jones matrix given by(a) Determine the polarization of the emerging light if the incident beam is a horizontal P-state.(b) Determine
Will we get an interference pattern in Young€™s Experiment (Fig. 9.11) if we replace the source slit S by a single long-filament lightbulb? What would occur if we replaced the slits S1and
Returning to Section 9.1, letwhere the wavefront shapes are not explicitly specified, and EËœ1 and EËœ2 are complex vectors depending on space and initial phase angle. Show
In Section 9.1 we considered the spatial distribution of energy for two point sources. We mentioned that for the case in which the separation α >> λ, I12 spatially averages to zero. Why is
Return to Fig. 2.25 and prove that if two electromagnetic plane waves making an angle Î¸ have the same amplitude, E0, the resulting interference pattern on the yx-plane is a
Figure P.9.5 shows an output pattern that was measured by a tiny microphone when two small piezo-loudspeakers separated by 15 cm were pointed toward the microphone at a distance of 1.5 m away. Given
Two 1.0-MHz radio antennas emitting in-phase are separated by 600 m along a north–south line. A radio receiver placed 2.0 km east is equidistant from both transmitting antennas and picks up a
Two parallel narrow slits in an opaque screen are separated by 0.100 mm. They are illuminated by plane waves of wavelength 589 nm. A cosine-squared fringe pattern wherein consecutive maxima are 3.00
Suppose the separation of the narrow slits in Young’s Experiment is 1.000 mm and the viewing screen is 5.000 m away. Plane waves of monochromatic 589.3-nm light illuminate the slits and the whole
An expanded beam of red light from a He–Ne laser (λ0 = 632.8 nm) is incident on a screen containing two very narrow horizontal slits separated by 0.200 mm. A fringe pattern appears on a white
Two pinholes in a thin sheet of aluminum are 1.00 mm apart and immersed in a large tank of water (n = 1.33). The holes are illuminated by λ0 = 589.3 nm plane waves, and the resulting fringe system
Red plane waves from a ruby laser (λ0 = 694.3 nm) in air impinge on two parallel slits in an opaque screen. A fringe pattern forms on a distant wall, and we see the fourth bright band 1.0°
A 3 × 5 card containing two pinholes, 0.08 mm in diameter and separated center to center by 0.10 mm, is illuminated by parallel rays of blue light from an argon ion laser (λ0 = 487.99 nm). If the
White light falling on two long narrow slits emerges and is observed on a distant screen. If red light (λ0 = 780 nm) in the first-order fringe overlaps violet in the second-order fringe, what is the
Consider the physical setup shown in Fig. 9.14. If the focal length of the second lens is Æ’, prove that maxima are located at ym, where ym= mÆ’(Î»/Î±).
Using the setup of Fig. 9.14, where the second lens has a focal length of f, determine an expression (in terms of f, λ, and a) for the separation between the centers of the first minima above and
Considering the double-slit experiment, derive an equation for the distance ym' from the central axis to the m'th irradiance minimum, such that the first dark bands on either side of the central
Two narrow slits in a thin metal sheet are 2.70 mm apart centerto-center. When illuminated directly by plane waves (in air) a fringe pattern appears on a screen 4.60 m away. It is found that
With regard to Young’s Experiment, derive a general expression for the shift in the vertical position of the mth maximum as a result of placing a thin parallel sheet of glass of index n and
Sunlight incident on a screen containing two long narrow slits 0.20 mm apart casts a pattern on a white sheet of paper 2.0 m beyond. What is the distance separating the violet (λ0 = 400 nm) in the
Plane waves of monochromatic light impinge at an angle θi on a screen containing two narrow slits separated by a distance α. Derive an equation for the angle measured from the central axis that
A stream of electrons, each having an energy of 0.5 eV, impinges on a pair of extremely thin slits separated by 10-2 mm. What is the distance between adjacent minima on a screen 20 m behind the
It is our intention to produce interference fringes by illuminating some sort of arrangement (Young’s Experiment, a thin film, the Michelson Interferometer, etc.) with light at a mean wavelength of
Imagine that you have an opaque screen with three horizontal very narrow parallel slits in it. The second slit is a center-to-center distance a beneath the first, and the third is a distance
Imagine a Fresnel double mirror (in air) illuminated by monochromatic light at 600.0 nm. The source slit is parallel to and 1.000 m from the line of intersection of the mirrors. If the bright fringes
In the Fresnel double mirror s = 2 m, λ0 = 589 nm, and the separation of the fringes was found to be 0.5 mm. What is the angle of inclination of the mirrors, if the perpendicular distance of
Show that Î± for the Fresnel biprism of Fig. 9.23 is given by Î± = 2d(n - 1)Î±.Fig. 9.23 Shield (a) Shield (b) Screen 20 R ry S, (c)
The Fresnel biprism is used to obtain fringes from a point source that is placed 2 m from the screen, and the prism is midway between the source and the screen. Let the wavelength of the light be λ0
What is the general expression for the separation of the fringes of a Fresnel biprism of index n immersed in a medium having an index of refraction n'?
A line source of sodium light (λ0 = 589.3 nm) illuminates a Lloyd’s mirror 10.0 mm above its surface. A viewing screen is 5.00 m from the source and the whole apparatus is in air. How far apart
Imagine that we have an antenna at the edge of a lake picking up a signal from a distant radio star (Fig. P.9.32), which is just coming up above the horizon. Write expressions for Î´ and
If the plate in Fig. 9.27 is glass in air, show that the amplitudes of E1r, E2r, and E3rare, respectively, 0.2E0i, 0.192E0i, and 0.008E0i, where E0iis the incident amplitude. Make use of the Fresnel
A soap film surrounded by air has an index of refraction of 1.34. If a region of the film appears bright red (λ0 = 633 nm) in normally reflected light, what is its minimum thickness there?
A soap film in air of index 1.34 has a region where it is 550.0 nm thick. Determine the wavelengths of the radiation that is not reflected when the film is illuminated from above with sunlight.
A thin uniform layer of water (n = 1.333) 25.0 nm thick exists on top of a sheet of clear plastic (n = 1.59). At what incident angle will the water strongly reflect blue light (Î»0= 460
Consider the circular pattern of Haidinger’s fringes resulting from a film with a thickness of 2 mm and an index of refraction of 1.5. For monochromatic illumination of λ0 = 600 nm, find the value
Illuminate a microscope slide (or even better, a thin cover-glass slide). Colored fringes can easily be seen with an ordinary fluorescent lamp (although some of the newer versions don€™t
Fringes are observed when a parallel beam of light of wavelength 500 nm is incident perpendicularly onto a wedge-shaped film with an index of refraction of 1.5. What is the angle of the wedge if the
Suppose a wedge-shaped air film is made between two sheets of glass, with a piece of paper 7.618 × 10-5 m thick used as the spacer at their very ends. If light of wavelength 500 nm comes down from
A wedge-shaped air film between two flat sheets of glass is illuminated from above by sodium light (λ0 = 589.3 nm). How thick will the film be at the center of the 173rd bright fringe (counted from
Figure P.9.43 illustrates a setup used for testing lenses. Show thatwhen d1 and d2 are negligible in comparison with 2R1 and 2R2, respectively. (Recall the theorem from plane geometry that relates
Newton’s rings are observed on a film with quasimonochromatic light that has a wavelength of 500 nm. If the 20th bright ring has a radius of 1.00 cm, what is the radius of curvature of the lens
When dust gets between the glass elements of a Newton€™s ring setup, it can cause an unknown shift in the film thickness Î”d, and a corresponding change in the fringe pattern.
Examining photos of Newton€™s rings we observe that fringes at large values of m seem to be nearly equally spaced. To see that analytically, show thatWhen m is large, the spacings between
A Michelson Interferometer is illuminated with monochromatic light. One of its mirrors is then moved 2.35 × 10-5 m, and it is observed that 92 fringe-pairs, bright and dark, pass by in the process.
Quasimonochromatic light with an average wavelength of 500 nm illuminates a Michelson Interferometer. The movable mirror-M1 is farther from the beamsplitter than is fixed mirror-M2 by a distance
Suppose we place a chamber 10.0 cm long with flat parallel windows in one arm of a Michelson Interferometer that is being illuminated by 600-nm light. If the refractive index of air is 1.000 29 and
Cadmium red light has a mean wavelength of Î»Ì…0= 643.847 nm (see Fig. 7.45) and a linewidth of 0.001 3 nm. When used to illuminate a Michelson Interferometer it is found that
A form of the Jamin Interferometer is illustrated in Fig. P.9.52. How does it work? To what use might it be put? Figure P.9.52
Starting with Eq. (9.53) for the transmitted wave, compute the flux density, that is, Eq. (9.54). Ế, = Egelo tt' Eoeiot 1 – pPe-ið (9.53) 14(t')? I; (1 + r4) – 2r² (9.54) cos 8
A point source S is a perpendicular distance R away from the center of a circular hole of radius a in an opaque screen. If the distance from S to the periphery of the hole is (R + ℓ), show that
Given that the mirrors of a Fabry€“Perot Interferometer have an amplitude reflection coefficient of r = 0.894 4, find(a) The coefficient of finesse,(b) The half-width,(c) The finesse,
Using Fig. 9.73, which depicts the geometry of the Shuttle radar interferometer, show thatz(x) = h - r1 cos Î¸Then use the Law of Cosines to establish that Eq. (9.108) is correct.Fig.
A glass camera lens with an index of 1.55 is to be coated with a cryolite film (n ≈ 1.30) to decrease the reflection of normally incident green light (λ0 = 500 nm). What thickness should be
A glass microscope lens having an index of 1.55 is to be coated with a magnesium fluoride film to increase the transmission of normally incident yellow light (λ0 = 500 nm). What minimum thickness
Determine the refractive index and thickness of a film to be deposited on a glass surface (ng = 1.54) such that no normally incident light of wavelength 540 nm is reflected.
Verify that the reflectance of a substrate can be increased by coating it with a λƒ/4, high-index layer, that is, n1 > ns. Show that the reflected waves interfere constructively. The
Satisfy yourself of the fact that a film of thickness λƒ/4 and index n1 will always reduce the reflectance of the substrate on which it is deposited, as long as ns > n1 > n0. Consider the
Consider the interference pattern of the Michelson Interferometer as arising from two beams of equal flux density. Using Eq. (9.17), compute the half-width. What is the separation, in Î´,
To fill in some of the details in the derivation of the smallest phase increment separating two resolvable Fabry€“Perot fringes, that is,satisfy yourself thatShow that Eq. (9.72) can be
Suppose we spread white light out into fan of wavelengths by means of a diffraction grating and then pass a small select region of that spectrum out through a slit. Because of the width of the slit,
A filter passes light with a mean wavelength of λ̅0 = 500 nm. If the emerging wavetrains are roughly 20λ̅0 long, what is the frequency bandwidth of the exiting light?
Suppose that we have a filter with a pass band of 1.0 Å centered at 600 nm, and we illuminate it with sunlight. Compute the coherence length of the emerging wave.
Imagine that we chop a continuous laserbeam (assumed to be monochromatic at λ0 = 632.8 nm) into 0.1-ns pulses, using some sort of shutter. Compute the resultant in width Δλ, bandwidth, and
A magnetic-field technique for stabilizing a He–Ne laser to 2 parts in 1010 has been patented. At 632.8 nm, what would be the coherence length of a laser with such a frequency stability?
The first* experiment directly measuring the bandwidth of a laser (in this case a continuous-wave Pb0.88Sn0.12 Te diode laser) was carried out in 1969. The laser, operating at λ0 = 10 600 nm, was
Consider a photon in the visible region of the spectrum emitted during an atomic transition of about 10-8 s. How long is the wave packet? Keeping in mind the results of the previous problem (if
A blue-light LED with a mean vacuum wavelength of 446 nm has a linewidth of 21 nm. Determine its coherence time and coherence length.
Derive an expression for the coherence length (in vacuum) of a wavetrain that has a frequency bandwidth Δv; express your answer in terms of the line width Δλ0 and the mean wavelength λ̅0 of
Write an expression for the transform A(Ï‰) of the harmonic pulse of Fig. P.7.54. Check that sinc u is 50% or greater for values of u roughly less than Ï€/2. With that in mind,
Examine Fig. P. 7.53, which shows three periodic functions and their corresponding Fourier frequency spectra. Discuss the graphs explaining what€™s happening in successive parts. What
Figure P.7.42 depicts an electric field in time and the Fourier components that compose it. The units are arbitrary. Given that(a) Explain why the series contains both sine and cosine terms.(b) Why
Change the upper limit of Eq. (7.59) from ˆž to Î± and evaluate the integral. Leave the answer in terms of the so-called sine integral:which is a function whose values are
Show that the Fourier series representation of the function Æ’(Î¸) = |sin Î¸| is cos 2m0 f(0) : 4m2 – 1 TT TT т3D 1
Take the function Æ’(Î¸) = Î¸2in the interval 0 < Î¸ < 2Ï€ and assume it repeats itself with a period of 2Ï€ . Now show that
Consider the periodic function defined over one wavelength byƒ(x) = (kx)2 where -π < kx < πwhich repeats over and over again with a period of 2π. Draw a diagram of ƒ(x) and determine the
Given the function ƒ(x) = A cos (πx/L), determine its Fourier series.

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