14. Two lenses of power 2.5 D and 1.5 D are joined
together. The focal length of the new lens
formed is
(A) 25 cm
(B) 100 cm
(C) 500
(D) 60 cm
- cm
3
Answers
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2
Answer:
P1 = - 2.5 D , P2 = + 1.5 D
Power of Combination ,
P = P1 + P2 = - 2.5 + 1.5 = 1.0 D
Focal length of combination ,
f = 1/p = - 1/1.0 m = 100
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