1.

two lens of +2.5 dioptre and 0.5 dioptre are placed in contact. find the power and focal length of lens combination. find focal length of lens combination also?

Answer»

Here = P1 = 2.5 D , P2 = 0.5 D

Power of Combination ,

P = P1 + P2 = 2.5 + 0.5 = 3.0 D

Focal LENGTH of combination ,

F = 1/p = 3/1.0 = 30



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