Surveying - Engineering
Q1: The power of a lensA
is reciprocal of its focal length
B
is positive if it is a convex lens
C
is negative if it is a concave lens
D
is measured in diopter.
ANS:D - is measured in diopter. The focal length f is positive for converging lenses and negative for diverging lenses. The reciprocal of the focal length, 1/f, is the optical power of the lens. If the focal length is in meters, this gives the optical power in dioptres (inverse meters). |
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