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?
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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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