Two lenses of focal length f1 and f2 are kept in contact coaxially. The power of the combination will be |
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(a) |
(b) |
(c) |
(d) |
Two lenses of focal length f1 and f2 are kept in contact coaxially. The power of the combination will be |
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(a) |
(b) |
(c) |
(d) |