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Constants
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1) The f-stop for a camera with a 50 mm focal length lens is
. What is the diameter of the lens opening to the nearest mm?
2) How far to the nearest tenth of a mm must the above camera lens be moved from its infinity setting in order to focus on an object
meters away?
3) If a farsighted eye has a near point of
centimeters, what is the power of the lens (to one decimal place) to correct this? Assume the lens is close to the eye.
4) A nearsighted eye has a far point of
centimeters, what is the power (to two decimal places) of the lens to correct this? Assume the lens is close to the eye.
5) What is the focal length to the nearest tenth of a centimeter of a magnifying glass with a maximum magnification of
?
6) If a telescope has an objective lens with a 10 m focal length.and an eyepiece with a focal length of
centimeters, what is its magnifying power?
7) What is the 'approximate' magnification of a compound microscope if the eyepiece has a focal length of 2 cm and the magnifying power of the objective is
X?
8) What is the intrinsic resolving power (in microRadians to 2 decimal places) of a
inch telescope using light of 600 nm?