I am nearsighted (myopic), so instead of my far point being infinitely far away,
ID: 1284499 • Letter: I
Question
I am nearsighted (myopic), so instead of my far point being infinitely far away, it's ony 80 cm away. How many diopters will my prescription glasses need? A. -1.25D B. +1.25D C. +2.75D D. none; my vision is fine!
2. B
y the Rayleigh criterion, if I use a 4-meter telescope, I can make out stars that are ____ as far apart
as stars observed through a 2-meter telescope
Equally
Half
Twice
None of the above
3. When the ciliary muscles of the eye remain tensed for a significant period of time, eyestrain results. Which of the following instruments is least related to eye strain?
A telescope
A microscope
A magnifying glass
Sunglasses
A.Equally
B.Half
C.Twice
D.None of the above
Explanation / Answer
1.Power P = 1/f = 1/0.8 = +1.25 D
option 2
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2. option C ( twice)
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C. A magnifying glass
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