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) |
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(b) |
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(c) |
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(d) |
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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) |
|