Asked by aditir | 23rd Jun, 2009, 12:50: AM
Pls post each question seperately.
Pls note that , "Dioptre" - the unit of power of a lens is denoted by capital 'D'.
(a) Positive power indicates that the lens is convex.Hence, in lenses having powers of + 2 D and +4 D are convex lenses.
focal length ( in metres) = 1 / power of the lens.
so, focal length of 1st lens , f1 = 1/ 2 m
and, focal length of 2nd lens , f 2 = 1 / 4 m.
Answered by | 23rd Jun, 2009, 01:36: AM
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