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Power and Thin Lenses in Contact

Two lenses of...

Question

Two lenses of powers – 15 D and +5D are in constant with each other. The focal length of the combination is

A

– 10 cm

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B

+ 20 cm

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C

+ 10 cm

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D

– 20 cm

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Solution

The correct option is A – 10 cm
Power of a lens combination is P1+P2+........
and power is reciprocal of focal length.
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