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| 1.
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What causes light waves to refract?
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| | A) | The speed of light is reduced to zero. |
| | B) | The speed of light remains constant. |
| | C) | The light is repelled by some materials. |
| | D) | The speed of light changes from one medium to the next. |
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| 2.
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What are the primary pigment colors?
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| | A) | red, orange, yellow, green, blue, indigo, and violet |
| | B) | black and white |
| | C) | red, blue, and yellow |
| | D) | yellow, magenta, and cyan |
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| 3.
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What is special about zoom lenses?
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| | A) | They have a long focal length. |
| | B) | They have no focal length. |
| | C) | They have a short focal length. |
| | D) | They allow you to change the focal length. |
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| 4.
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A source of light emits light rays __________.
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| | A) | in a circle |
| | B) | in all directions |
| | C) | in a straight line |
| | D) | only at right angles |
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| 5.
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A blue car looks blue because __________.
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| | A) | blue light is absorbed while others are reflected |
| | B) | the blue car emits blue light |
| | C) | blue light is reflected while others are absorbed |
| | D) | the blue car is opaque |
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| 6.
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What is a focal length?
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| | A) | the distance light travels along a reflective surface |
| | B) | the difference between the angle of incidence and the angle of reflection |
| | C) | the distance from the center of the mirror to the focal point |
| | D) | the distance from the mirror to the reflecting object |
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| 7.
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To correct nearsightedness, which lenses should be used?
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| | A) | concave |
| | B) | convex |
| | C) | reflecting |
| | D) | plane |
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| 8.
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A wave transfers __________.
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| | A) | gas |
| | B) | energy |
| | C) | matter |
| | D) | liquid |
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| 9.
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Where does an image form on the eye?
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| | A) | the retina |
| | B) | the optic nerve |
| | C) | the cornea |
| | D) | the lens |
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| 10.
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What type of lenses do microscopes use?
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| | A) | convex |
| | B) | plane |
| | C) | reflecting |
| | D) | concave |
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| 11.
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What is the main purpose of a telescope?
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| | A) | to magnify an image |
| | B) | to gather as much light as possible |
| | C) | to make objects appear closer |
| | D) | to reflect light at an object |
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| 12.
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What occurs to light waves in a convex mirror?
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| | A) | They converge. |
| | B) | They diverge. |
| | C) | They reflect at right angles. |
| | D) | They are absorbed. |
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| 13.
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The speed of light is __________.
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| | A) | slower in water than in air |
| | B) | fastest in water |
| | C) | faster in water than in air |
| | D) | the same speed in water and air |
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| 14.
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All lenses have __________.
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| | A) | no curves at all |
| | B) | only one curved side |
| | C) | two curved sides |
| | D) | at least one curved side |
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| 15.
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Object A reflects more than object B. Therefore, object A is __________ object B.
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| | A) | made of the same material as |
| | B) | smoother than |
| | C) | just as smooth as |
| | D) | rougher than |
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| 16.
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Which is not a primary color?
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| | A) | red |
| | B) | yellow |
| | C) | blue |
| | D) | green |
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| 17.
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What is called the normal to the surface?
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| | A) | the line perpendicular to where the light ray strikes the surface |
| | B) | the reflecting surface itself |
| | C) | the angle of the incoming beam of light |
| | D) | the line parallel to a reflecting surface |
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| 18.
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Why can you see most objects?
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| | A) | light refracts through them |
| | B) | light reflects off them |
| | C) | they emit light |
| | D) | they absorb light |
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| 19.
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The image formed by a concave lens is similar to that formed by a __________.
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| | A) | convex mirror |
| | B) | plane mirror |
| | C) | convex lens |
| | D) | concave mirror |
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| 20.
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Objects that allow only some light to pass through them are considered __________.
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| | A) | opaque |
| | B) | solid |
| | C) | transparent |
| | D) | translucent |
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