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A convex lens and a concave lens ,each h...

A convex lens and a concave lens ,each having same focal length of 25 cm,are put in contact to form a combination of lenses.the power of the combination (in diopters) is

A

zero

B

25

C

50

D

infinite

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
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  4. Two thin lenses of focal length f1 and f2 are in contact and coaxial.T...

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