Chapter 19 Quiz

Light refracts when it passes from air to water because

• the wavelength is different in the two media.

• the frequency is different in the two media.

• the speed is different in the two media.

• the speed is different in the two media.

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Which type(s) of lens can form a real image?

• Concave lens only

• Convex lens only

• Both convex and concave lenses

• Neither convex or concave lenses

The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in a material.

• True

• False

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The image in a plane mirror appears to be

• In front of the mirror

• Behind the mirror

• In the plane of the mirror

• Perpendicular to the plane of the mirror

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A real image formed by a mirror is

• always right side up

• always smaller than the object

• able to be projected on a screen

• only formed by convex mirrors

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According to the law of reflection, the angle of reflection is inverse to the angle of incidence.

• True

• False

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A refracting telescope collects and focuses light from distant stars with a

• convex lens

• concave lens

• convex mirror

• concave mirror

How is a camera brought into focus?

• The type of film or sensor is matched to the amount of light.

• Lenses are moved closer to or farther from the film or sensor.

• Lenses are moved closer to or farther from other lenses.

• The mirror changes the length of the light path in the camera.

What is the function of the iris in a human eye?

• allows light to enter the eye

• focuses light on the retina

• transmits light to the optic nerve

• controls the amount of light that enters the eye

The correction for nearsightedness, in which the image focuses in front of the retina, is made with a concave lens.

• True

• False