Image height divided by object height gives

	a.	magnification.
	b.	virtual image size.
	c.	image distance.
	d.	real image size.
	e.	object distance.

2 points

QUESTION 5

Optical fibers work because of

	a.	polarization.
	b.	diffraction.
	c.	interference.
	d.	diffuse reflection.
	e.	total internal reflection.

2 points

QUESTION 6

Upon entering a medium in which the speed of light is 1.510⁸m/s from a medium in which the speed of light is 210⁸m/s, an oblique light ray will be _____________ the normal to the interface between the two media.

	a.	bent toward
	b.	remain undeviated with respect to
	c.	bent away from
	d.	travel along

2 points

QUESTION 7

In this figure a light ray travels between air and glass. Which way did the light ray go?

	a.	from the air into the glass
	b.	from the glass into the air
	c.	either A or B.
	d.	None of the abovethis depicts an impossible situation.

2 points

QUESTION 8

The lens formula relating the image distance,p, to the focal length,f, and object distance,s, is The magnification of a lens is

A movie projector is equipped with a 0.5-m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is

	a.	0.505 m.
	b.	500 m.
	c.	0.5 m.
	d.	505 m.
	e.	50.5 m.

2 points

QUESTION 9

The sky is blue because of

	a.	diffraction.
	b.	polarization.
	c.	scattering.
	d.	dispersion.
	e.	interference.

2 points

QUESTION 10

An object is 50 cm in front of a plane mirror. Its image will be located

	a.	50 cm in front of the mirror.
	b.	25 cm in front of the mirror.
	c.	25 cm behind the mirror.
	d.	at the mirror's surface.
	e.	50 cm behind the mirror.

2 points

QUESTION 11

The colors of objects we see by reflected light are due to

	a.	specular reflection.
	b.	selective absorption.
	c.	diffuse reflection.
	d.	interference.

2 points

QUESTION 12

A nanometer is

	a.	one thousandth of a meter.
	b.	one millionth of a meter.
	c.	one billionth of a meter.
	d.	one trillionth of a meter.
	e.	none of the above.

2 points

QUESTION 13

What is meant by the term "plane mirror?"

	a.	not an unusual mirror
	b.	a flat mirror
	c.	a horizontal mirror
	d.	none of the above

2 points

QUESTION 14

Diverging light rays from a nearby object (a few focal lengths away from the mirror) strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at

	a.	the mirror's focal point.
	b.	a point beyond the mirror's focal point.
	c.	a point nearer than the mirror's focal point.
	d.	none of the above.

2 points

QUESTION 15

The type of mirror that will allow you to see large areas normally hidden from your view is

	a.	Polaroid.
	b.	convex.
	c.	half-silvered.
	d.	plane.
	e.	concave.

2 points

QUESTION 16

Light goes slower through glass than through air.

True

False

3 points

QUESTION 17

When you look into a pool of water, the depth looks less than it actually is because the light is dispersed.

True

False

3 points

QUESTION 18

Astigmatism is due to too flat a cornea.

True

False

3 points

QUESTION 19

The colors you see with a prism result because the light is diffracted.

True

False

3 points

QUESTION 20

A one-way mirror works because its surfaces are half-silvered.

True

False

3 points

QUESTION 21

In the atmosphere, the intensity of scattered sunlight of longer wavelength is greater than that of shorter wavelength.

True

False

3 points

QUESTION 22

Diverging lenses have negative focal lengths.

True

False

3 points

QUESTION 23

Liquid crystal displays make use of interference of light.

True

False

3 points

QUESTION 24

A diverging lens is thicker at the center than the edges.

True

False

3 points

QUESTION 25

Dispersion results because the speed of light in a transparent medium varies with frequency.

True

False