1. hyperopia is usually corrected with A. cylindrical lenses B. achromatic doubl
ID: 1342091 • Letter: 1
Question
1. hyperopia is usually corrected with
A.
cylindrical lenses
B.
achromatic doublet lenses
C.
diverging lenses
D.
converging lenses
2. When the ciliary muscles of the eye remain tensed for a significant period of time looking at something up close, eyestrain results. Which of the following instruments is not designed to ease eye strain?
A telescope
A microscope
A magnifying glass
Sunglasses
3. Observatories are usually located on mountaintops because
On the mountaintop it's closer to the stars
Higher up the air is steadier and drier, and this makes for better seeing of the sky
There is less wind on a mountaintop
It's usually warmer on mountaintops, making it easier on astronomers
4. Parallel rays of light are shown entering the lens system in the attached diagram. The two lenses are separated by their combined focal lengths. Which answer best describes the rays after they pass through the second lens?
Beam widens (but rays still parallel)
Beam narrows (but rays still parallel)
Beam is focused
Beam diverges
5. myopia is usually corrected with
cylindrical lenses
achromatic doublet lenses
diverging lenses
converging lenses
7. The benefit of using a Schmidt corrector plate in a reflecting telescope is that
It bends the incoming parallel rays just enough to correct for the spherical aberration of the primary mirror
It covers the top of the telescope tube, keeping dirt and air currents out of the tube
Both A and B
It brings the rays to a focus
8. Why do reflecting telescopes use curved mirrors instead of flat mirrors?
To make converging beams of light become parallel
To redirect parallel beams of light to converge to a point
Because curved mirrors reflect light in a wavelength-dependent way
None of the above
A.
cylindrical lenses
B.
achromatic doublet lenses
C.
diverging lenses
D.
converging lenses
Explanation / Answer
1. D.converging lenses
2. D.Sunglasses
3. B.Higher up the air is steadier and drier, and this makes for better seeing of the sky
4. C Beam is focused
5. C. Diverging lenses
7. . C.Both A and B
8. B.To redirect parallel beams of light to converge to a point
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