Ch23

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Chapter 23
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)
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)
Two plane mirrors form a right angle. How many images
of the ball can you see in the mirrors?
1. 1
2. 2
3. 3
4. 4
Two plane mirrors form a right angle. How many images
of the ball can you see in the mirrors?
1. 1
2. 2
3. 3
4. 4
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 can’t compare n1 to n3 without knowing n2.
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 can’t compare n1 to n3 without knowing n2.
A lens produces a sharplyfocused, inverted image
on a screen. What will
you see on the screen if
the lens is removed?
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 sharplyfocused, inverted image
on a screen. What will
you see on the screen if
the lens is removed?
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.
Which of these
actions will move
the image point P´
further from the
boundary?
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 these
actions will move
the image point P´
further from the
boundary?
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.
The image of a slide on the screen is blurry because the
screen 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.
The image of a slide on the screen is blurry because the
screen 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.
Four diffraction-limited lenses focus plane waves of light
with the same wavelength l. Rank order, from largest to
smallest, the spot sizes w1 to w4.
1.
2.
3.
4.
5.
w1 > w4 > w2 = w3
w1 = w2 > w3 > w4
w2 = w3 > w4 > w1
w4 > w3 > w1 = w2
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 w1 to w4.
1.
2.
3.
4.
5.
w1 > w4 > w2 = w3
w1 = w2 > w3 > w4
w2 = w3 > w4 > w1
w4 > w3 > w1 = w2
w2 > w1 = w3 > w4
Chapter 23
Reading Quiz
What is specular reflection?
1.
2.
3.
4.
5.
The image of a specimen.
A reflection that separates different colors.
Reflection by a flat smooth object.
When the image is virtual and special.
This topic is not covered in Chapter 23.
What is specular reflection?
1.
2.
3.
4.
5.
The image of a specimen.
A reflection that separates different colors.
Reflection by a flat smooth object.
When the image is virtual and special.
This topic is not covered in Chapter 23.
A paraxial ray
1. moves in a parabolic path.
2. is a ray that has been reflected from
parabolic 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.
A paraxial ray
1. moves in a parabolic path.
2. is a ray that has been reflected from
parabolic 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.
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.
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.
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 the
back surface.
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 the
back surface.

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