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Chapter 23

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A long, thin light bulb illuminates a vertical aperture.

Which pattern of light do you see on a viewing screen

behind the aperture?

(1) (2) (3) (4)

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A long, thin light bulb illuminates a vertical aperture.

Which pattern of light do you see on a viewing screen

behind the aperture?

(1) (2) (3) (4)

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Two plane mirrors form a right angle. How many images

of the ball can you see in the mirrors?

1. 12. 2

3. 3

4. 4

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Two plane mirrors form a right angle. How many images

of the ball can you see in the mirrors?

1. 12. 2

3. 3

4. 4

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A light ray travels

from medium 1 to

medium 3 as

shown.

For these media,

1. n3< n1.

2. n3= n1.

3. n3> n1.

4. We cant compare n1to n3without knowing n2.

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A light ray travels

from medium 1 to

medium 3 as

shown.

For these media,

1. n3< n1.

2. n3= n1.

3. n3> n1.

4. We cant compare n1to n3without knowing n2.

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1. The image will be as it was, but much dimmer.

2. The image will be right-side-up and sharp.3. The image will be right-side-up and blurry.

4. The image will be inverted and blurry.

5. There will be no image at all.

A lens produces a sharply-

focused, inverted image

on a screen. What willyou see on the screen if

the lens is removed?

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1. The image will be as it was, but much dimmer.

2. The image will be right-side-up and sharp.3. The image will be right-side-up and blurry.

4. The image will be inverted and blurry.

5. There will be no image at all.

A lens produces a sharply-

focused, inverted image

on a screen. What willyou see on the screen if

the lens is removed?

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1. Increase the radius of curvature R.

2. Increase the index of refraction n.3. Increase the object distance s.

4. Decrease the radius of curvature R.

Which of theseactions will move

the image point P

further from the

boundary?

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1. Increase the radius of curvature R.

2. Increase the index of refraction n.3. Increase the object distance s.

4. Decrease the radius of curvature R.

Which of theseactions will move

the image point P

further from the

boundary?

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The image of a slide on the screen is blurry because thescreen is in front of the image plane. To focus the image,

should you move the lens toward the slide or away from

the slide?

1. Toward the slide.

2. Away from the slide.

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1. Toward the slide.

2. Away from the slide.

The image of a slide on the screen is blurry because thescreen is in front of the image plane. To focus the image,

should you move the lens toward the slide or away from

the slide?

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1. w1> w4> w2= w3

2. w1= w2> w3> w43. w2= w3> w4> w1

4. w4> w3> w1= w2

5. w2> w1= w3> w4

Four diffraction-limited lenses focus plane waves of light

with the same wavelength l. Rank order, from largest to

smallest, the spot sizes w1to w4.

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1. w1> w4> w2= w3

2. w1= w2> w3> w43. w2= w3> w4> w1

4. w4> w3> w1= w2

5. w2> w1= w3> w4

Four diffraction-limited lenses focus plane waves of light

with the same wavelength l. Rank order, from largest to

smallest, the spot sizes w1to w4.

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Chapter 23Reading Quiz

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What is specular reflection?

1. The image of a specimen.

2. A reflection that separates different colors.

3. Reflection by a flat smooth object.

4. When the image is virtual and special.

5. This topic is not covered in Chapter 23.

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What is specular reflection?

1. The image of a specimen.

2. A reflection that separates different colors.

3. Reflection by a flat smooth object.

4. When the image is virtual and special.

5. This topic is not covered in Chapter 23.

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A paraxial ray

1. moves in a parabolic path.

2. is a ray that has been reflected fromparabolic mirror.

3. is a ray that moves nearly parallel to

the optical axis.

4. is a ray that moves exactly parallel to

the optical axis.

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A paraxial ray

1. moves in a parabolic path.

2. is a ray that has been reflected fromparabolic mirror.

3. is a ray that moves nearly parallel

to the optical axis.

4. is a ray that moves exactly parallel to

the optical axis.

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A virtual image is

1. the cause of optical illusions.2. a point from which rays appear to diverge.

3. an image that only seems to exist.

4. the image that is left in space after you remove

a viewing screen.

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A virtual image is

1. the cause of optical illusions.2. a point from which rays appear to diverge.

3. an image that only seems to exist.

4. the image that is left in space after you remove

a viewing screen.

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The focal length of a converging lens is

1. the distance at which an image is formed.

2. the distance at which an object must be

placed to form an image.

3. the distance at which parallel light rays are

focused.

4. the distance from the front surface to theback surface.

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The focal length of a converging lens is

1. the distance at which an image is formed.

2. the distance at which an object must be

placed to form an image.

3. the distance at which parallel light rays

are focused.

4. the distance from the front surface to theback surface.