PHY 102 - Chapter 14 Test Exam Questions and Correct Answers Latest Update 2024 (Already Passed)
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PHY 102 - Chapter 14
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PHY 102 - Chapter 14
PHY 102 - Chapter 14 Test Exam Questions and Correct Answers Latest Update 2024 (Already Passed)
Your camera has a 25-mm focal length lens. When you take a photograph of a distant mountain, how far from that lens is the real image of the mountain? - Answers 25 mm
On a bright, sunny day you can us...
PHY 102 - Chapter 14 Test Exam Questions and Correct Answers Latest Update 2024 (Already Passed)
Your camera has a 25-mm focal length lens. When you take a photograph of a distant mountain, how far
from that lens is the real image of the mountain? - Answers 25 mm
On a bright, sunny day you can use a magnifying glass to burn wood by focusing sunlight onto it. The
focused sunlight forms a small circular spot of light that heats the wood until it burns. Why is the spot of
light circular? - Answers It is a real image of the circular sun itself.
(Magnifying glasses use converging lenses and although a real image of the sun is produced, the image is
inverted.)
Light passing through a curved water glass forms an image of the candle flame on the wall beside the
table. Why would moving the candle toward or away from the glass spoil this effect? - Answers The
water glass acts as a lens and changing the distance between the candle and that lens will change the
distance between the lens and the real image formed.
In a movie, an actor's eyeglasses send a brief undistorted reflection of the sun at the camera. Why does
that simple reflection tell you that the glasses are props and that the actor doesn't need eyeglasses? -
Answers The reflection indicates that the eyeglass lenses are flat plates because an undistorted
reflection is produced and therefore the lenses have no curvature to bend light which is required to
correct vision problems.
Sports photographers often use large aperture, long focal length lenses. What limitations do these
lenses impose on the photographs? - Answers Their depths of focus are relatively small.
If you hold your camera up to a small hole in a fence, you will be able to take a picture of the scene on
the other side. However, the exposure time will have to be quite long, and the depth of focus will be
surprisingly large. Explain. - Answers The hole effectively reduces the diameter of the camera lens and
small diameter lenses have large depths of focus because the few light rays that manage to get through
the small opening are already close to one another but they require longer exposures because so little
light passes through the narrow lens opening.
Why does squinting increase your depth of focus? - Answers Squinting your eyes reduces the size of
your eye's aperture by decreasing its effective diameter which in turn increases its depth of focus.
The objective lens in a DVD player must move quickly to keep the laser beam focused on the disc's
reflective layer. Why must this lens have a very small mass? - Answers The lens has a small mass which
results in a rapid acceleration when modest forces act on it; The lens has a small mass which has little
inertia and therefore can be accelerated rapidly; The lens has a small mass which results in less
resistance to changes in its motion and therefore can be accelerated rapidly. (All of the above choices
are correct.)
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