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physics
physics scientists and engineers

Questions and Answers of Physics Scientists and Engineers

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm (blue).Light from a hydrogen lamp illuminates a diffraction grating with 500 lines/mm,
A fish in a flat-sided aquarium sees a can of fish food on the counter. To the fish’s eye, the can looks to be 30 cm outside the aquarium. What is the actual distance between the can and the
The 80-cm-tall, 65-cm-wide tank shown in FIGURE P34.49 is completely filled with water. The tank has marks every 10 cm along one wall, and the 0 cm mark is barely submerged. As you stand beside the
A horizontal meter stick is centered at the bottom of a 3.0 m-deep, 3.0-m-wide pool of water. How long does the meter stick appear to be as you look at it from the edge of the pool?
A 4.0-m-wide swimming pool is filled to the top. The bottom of the pool becomes completely shaded in the afternoon when the sun is 20° above the horizon. How deep is the pool?
It’s nighttime, and you’ve dropped your goggles into a 3.0-m deep swimming pool. If you hold a laser pointer 1.0 m above the edge of the pool, you can illuminate the goggles if the laser beam
An astronaut is exploring an unknown planet when she accidentally drops an oxygen canister into a 1.50-m-deep pool filled with an unknown liquid. Although she dropped the canister 21 cm from the
Shown from above in FIGURE P34.54 is one corner of a rectangular box filled with water. A laser beam starts 10 cm from side A of the container and enters the water at position x. You can ignore the
A light beam can use reflections to form a closed, N-sided polygon inside a solid, transparent cylinder if N is sufficiently large. What is the minimum possible value of N for light inside a cylinder
Optical engineers need to know the cone of acceptance of an optical fiber. This is the maximum angle that an entering light ray can make with the axis of the fiber if it is to be guided down the
One of the contests at the school carnival is to throw a spear at an underwater target lying flat on the bottom of a pool. The water is 1.0 m deep. You’re standing on a small stool that places your
There??s one angle of incidence β onto a prism for which the light inside an isosceles prism travels parallel to the base and emerges at angle β.a. Find an expression for β in terms of the
You’re visiting the shark tank at the aquarium when you see a 2.5-m-long shark that appears to be swimming straight toward you at 2.0 m/s. What is the shark’s actual speed through the water? You
Paraxial light rays approach a transparent sphere parallel to an optical axis passing through the center of the sphere. The rays come to a focus on the far surface of the sphere. What is the
To determine the focal length of a lens, you place the lens in front of a small lightbulb and then adjust a viewing screen to get a sharply focused image. Varying the lens position produces the
The illumination lights in an operating room use a concave mirror to focus an image of a bright lamp onto the surgical site. One such light uses a mirror with a 30 cm radius of curvature. If the
A dentist uses a curved mirror to view the back side of teeth in the upper jaw. Suppose she wants an upright image with a magnification of 1.5 when the mirror is 1.2 cm from a tooth. Should she use a
A keratometer is an optical device used to measure the radius of curvature of the eye’s cornea—its entrance surface. This measurement is especially important when fitting contact lenses, which
The mirror in FIGURE P34.65 is covered with a piece of glass. A point source of light is outside the glass. How far from the mirror is the image of this source? 4.0 cm 2.0 cm Glass FIGURE P34.65
A 2.0-cm-tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 32 cm. How many places can you put the lens to form a well-focused image of the candle flame on the
A 25 g rubber ball is dropped from a height of 3.0 m above the center of a horizontal, concave mirror. The ball and its image coincide 0.65 s after the ball is released. What is the mirror’s radius
In recent years, physicists have learned to create metamaterials— engineered materials not found in natur —with negative indices of refraction. It’s not yet possible to form a lens from a
A lightbulb is 3.0 m from a wall. What are the focal length and the position (measured from the bulb) of a lens that will form an image on the wall that is twice the size of the lightbulb?
An old-fashioned slide projector needs to create a 98-cm high image of a 2.0-cm-tall slide. The screen is 300 cm from the slide.a. What focal length does the lens need? Assume that it is a thin
Some electro-optic materials can change their index of refraction in response to an applied voltage. Suppose a planoconvex lens (flat on one side, a 15.0 cm radius of curvature on the other), made
A point source of light is distance d from the surface of a 6.0 cm-diameter glass sphere. For what value of d is there an image at the same distance d on the opposite side of the sphere?
A lens placed 10 cm in front of an object creates an upright image twice the height of the object. The lens is then moved along the optical axis until it creates an inverted image twice the height of
An object is 60 cm from a screen. What are the radii of a symmetric converging plastic lens (i.e., two equally curved surfaces) that will form an image on the screen twice the height of the object?
A wildlife photographer with a 200-mm-focal-length telephoto lens on his camera is taking a picture of a rhinoceros that is 100 m away. Suddenly, the rhino starts charging straight toward the
A concave mirror has a 40 cm radius of curvature. How far from the mirror must an object be placed to create an upright image three times the height of the object?
A 2.0-cm-tall object is placed in front of a mirror. A 1.0-cm-tall upright image is formed behind the mirror, 150 cm from the object. What is the focal length of the mirror?
A spherical mirror of radius R has its center at C, as shown in FIGURE P34.78. A ray parallel to the axis reflects through F, the focal point. Prove that f = R/2 if ϕ << 1 rad. C-- 18 FIGURE
Consider a lens having index of refraction n2 and surfaces with radii R1 and R2. The lens is immersed in a fluid that has index of refraction n1.a. Derive a generalized lens maker’s equation to
FIGURE CP34.80 shows a light ray that travels from point A to point B. The ray crosses the boundary at position x, making angles θ1and θ2in the two media. Suppose that you did not know Snell??s
A fortune teller’s “crystal ball” (actually just glass) is 10 cm in diameter. Her secret ring is placed 6.0 cm from the edge of the ball.a. An image of the ring appears on the opposite side of
Consider an object of thickness ds (parallel to the axis) in front of a lens or mirror. The image of the object has thickness ds′. Define the longitudinal magnification as M = ds′/ds. Prove that
Suppose a camera’s exposure is correct when the lens has a focal length of 8.0 mm. Will the picture be overexposed, underexposed, or still correct if the focal length is “zoomed” to 16.0 mm
A camera has a circular aperture immediately behind the lens. Reducing the aperture diameter to half its initial value willA. Make the image blurry.B. Cut off the outer half of the image and leave
The meter stick in FIGURE P34.48 lies on the bottom of a 100-cm-long tank with its zero mark against the left edge. You look into the tank at a 30? angle, with your line of sight just grazing the
A light ray in air is incident on a transparent material whose index of refraction is n.a. Find an expression for the (non-zero) angle of incidence whose angle of refraction is half the angle of
A microscope is focused on a black dot. When a 1.00-cm thick piece of plastic is placed over the dot, the microscope objective has to be raised 0.40 cm to bring the dot back into focus. What is the
The place you get your hair cut has two nearly parallel mirrors 5.0 m apart. As you sit in the chair, your head is 2.0 m from the nearer mirror. Looking toward this mirror, you first see your face
A red ball is placed at point A in FIGURE P34.44. a. How many images are seen by an observer at point O?b. What are the (x, y) coordinates of each image? 3.0 m 2.0 m 3.0 m 1.0 m FIGURE P34.44
An advanced computer sends information to its various parts via infrared light pulses traveling through silicon fibers. To acquire data from memory, the central processing unit sends a light-pulse
A 1.0-cm-tall object is 20 cm in front of a convex mirror that has a -60 cm focal length. Calculate the position and height of the image. State whether the image is in front of or behind the mirror,
A 1.0-cm-tall object is 20 cm in front of a concave mirror that has a 60 cm focal length. Calculate the position and height of the image. State whether the image is in front of or behind the mirror,
An object is 30 cm in front of a convex mirror with a focal length of -20 cm. Use ray tracing to locate the image. Is the image upright or inverted?
An object is 12 cm in front of a concave mirror with a focal length of 20 cm. Use ray tracing to locate the image. Is the image upright or inverted?
An object is 40 cm in front of a concave mirror with a focal length of 20 cm. Use ray tracing to locate the image. Is the image upright or inverted?
A 2.0-cm-tall object is 15 cm in front of a diverging lens that has a -20 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.0-cm-tall object is 60 cm in front of a diverging lens that has a -30 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 2.0-cm-tall object is 15 cm in front of a converging lens that has a 20 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.0-cm-tall object is 75 cm in front of a converging lens that has a 30 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 2.0-cm-tall object is 40 cm in front of a converging lens that has a 20 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.0-cm-tall object is 10 cm in front of a converging lens that has a 30 cm focal length.a. Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper
A 1.0-cm-tall candle flame is 60 cm from a lens with a focal length of 20 cm. What are the image distance and the height of the flame’s image?
A goldfish lives in a 50-cm-diameter spherical fish bowl. The fish sees a cat watching it. If the cat’s face is 20 cm from the edge of the bowl, how far from the edge does the fish see it as being?
An air bubble inside an 8.0-cm-diameter plastic ball is 2.0 cm from the surface. As you look at the ball with the bubble turned toward you, how far beneath the surface does the bubble appear to be?
Find the focal length of the meniscus polystyrene plastic lens in FIGURE EX34.28. 30 cm 40 cm Meniscus lens FIGURE EX34.28
Find the focal length of the glass lens in FIGURE EX34.27. 40 cm 40 cm FIGURE EX34.27
Find the focal length of the planoconvex polystyrene plastic lens in FIGURE EX34.26. 40 cm Planoconvex lens FIGURE EX34.26
Find the focal length of the glass lens in FIGURE EX34.25. 24 cm 40 cm FIGURE EX34.25
An object is 15 cm in front of a diverging lens with a focal length of -15 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted?
An object is 6 cm in front of a converging lens with a focal length of 10 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted?
An object is 30 cm in front of a converging lens with a focal length of 5 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted?
An object is 20 cm in front of a converging lens with a focal length of 10 cm. Use ray tracing to determine the location of the image. Is the image upright or inverted?
To a fish in an aquarium, the 4.00-mm-thick walls appear to be only 3.50 mm thick. What is the index of refraction of the walls?
A 150-cm-tall diver is standing completely submerged on the bottom of a swimming pool full of water. You are sitting on the end of the diving board, almost directly over her. How tall does the diver
A biologist keeps a specimen of his favorite beetle embedded in a cube of polystyrene plastic. The hapless bug appears to be 2.0 cm within the plastic. What is the beetle’s actual distance beneath
FIGURE EX34.16 shows a transparent hemisphere with radius R and index of refraction n. What is the maximum distance d for which a light ray parallel to the axis refracts out through the curved
A thin glass rod is submerged in oil. What is the critical angle for light traveling inside the rod?
The glass core of an optical fiber has an index of refraction 1.60. The index of refraction of the cladding is 1.48. What is the maximum angle a light ray can make with the wall of the core if it is
An underwater diver sees the sun 50° above horizontal. How high is the sun above the horizon to a fisherman in a boat above the diver?
A costume jewelry pendant made of cubic zirconia is submerged in oil. A light ray strikes one face of the zirconia crystal at an angle of incidence of 25°. Once inside, what is the ray’s angle
A 1.0-cm-thick layer of water stands on a horizontal slab of glass. A light ray in the air is incident on the water 60° from the normal. What is the ray’s direction of travel in the glass?
A laser beam in air is incident on a liquid at an angle of 53° with respect to the normal. The laser beam’s angle in the liquid is 35°. What is the liquid’s index of refraction?
When you look at your reflection in the bowl of a spoon, it is upside down. Why?
You see an upright, magnified image of your face when you look into a magnifying cosmetic mirror. Where is the image? Is it in front of the mirror’s surface, on the mirror’s surface, or behind
It is 165 cm from your eyes to your toes. You’re standing 200 cm in front of a tall mirror. How far is it from your eyes to the image of your toes?
A concave mirror brings the sun’s rays to a focus in front of the mirror. Suppose the mirror is submerged in a swimming pool but still pointed up at the sun. Will the sun’s rays be focused nearer
A laser beam is incident on the left mirror in FIGURE EX34.8. Its initial direction is parallel to a line that bisects the mirrors.What is the angle Ï• of the reflected laser beam? 80°
A converging lens creates the image shown in FIGURE Q34.8. Is the object distance less than the focal length f, between f and 2f, or greater than 2f? Explain. FIGURE Q34.8
At what angle Ï• should the laser beam in FIGURE EX34.7 be aimed at the mirrored ceiling in order to hit the midpoint of the far wall? Mirror 3.0 m Wall Laser beam FIGURE EX34.7 5.0 m
The object and lens in FIGURE Q34.7 are positioned to form a well-focused, inverted image on a viewing screen. Then a piece of cardboard is lowered just in front of the lens to cover the top half of
The mirror in FIGURE EX34.6 deflects a horizontal laser beam by 60°. What is the angle Ï•? 60° FIGURE EX34.6
Consider one point on an object near a lens.a. What is the minimum number of rays needed to locate its image point? Explain.b. How many rays from this point actually strike the lens and refract to
A light ray leaves point A in FIGURE EX34.5, reflects from the mirror, and reaches point B. How far below the top edge does the ray strike the mirror? 5 cm 10 cm A Mirror 15 cm 15 cm FIGURE EX34.5
A fish in an aquarium with flat sides looks out at a hungry cat. To the fish, does the distance to the cat appear to be less than the actual distance, the same as the actual distance, or more than
A 5.0-cm-thick layer of oil is sandwiched between a 1.0-cm-thick sheet of glass and a 2.0-cm-thick sheet of polystyrene plastic. How long (in ns) does it take light incident perpendicular to the
A light beam passing from medium 2 to medium 1 is refracted as shown in FIGURE Q34.4. Is n1larger than n2, is n1smaller than n2, or is there not enough information to tell? Explain. 1 2.
A student has built a 15-cm-long pinhole camera for a science fair project. She wants to photograph her 180-cm tall friend and have the image on the film be 5.0 cm high. How far should the front of
One problem with using optical fibers for communication is that a light ray passing directly down the center of the fiber takes less time to travel from one end to the other than a ray taking a
a. How long (in ns) does it take light to travel 1.0 m in vacuum?b. What distance does light travel in water, glass, and cubic zirconia during the time that it travels 1.0 m in vacuum?
You are looking at the image of a pencil in a mirror, as shown in FIGURE Q34.2. a. What happens to the image if the top half of the mirror, down to the midpoint, is covered with a piece of
A point source of light illuminates an aperture 2.0 m away. A 12.0-cm-wide bright patch of light appears on a screen 1.0 m behind the aperture. How wide is the aperture?
Is the electric field strength in FIGURE Q31.5 increasing, decreasing, or not changing? Explain. Induced B FIGURE Q31.5
The intensity of an electromagnetic wave is 10 W/m2. What will the intensity be if:a. The amplitude of the electric field is doubled?b. The amplitude of the magnetic field is doubled?c. The
What capacitance, in цF, has its potential difference increasing at 1.0 × 106 V/s when the displacement current in the capacitor is 1.0 A?
A series RL circuit is built with a 110 Ω resistor and a 5.0-cm long, 1.0-cm-diameter solenoid with 800 turns of wire. What is the peak magnetic flux through the solenoid if the circuit is driven by
A proton is fired with a speed of 1.0 × 106m/s through the parallel-plate capacitor shown in FIGURE P31.31. The capacitor??s electric field is E = (1.0 × 105V/m, down). a. What magnetic field B,

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