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Lens Formula

Two thin lens...

Question

Two thin lenses of optical powers of $- 10 D$ and $+ 6 D$ are placed in contact to each other. The focal length of combination is

A

+ 0.25 c m

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B

- 0.25 c m

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C

+ 0.25 m

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D

- 0.25 m

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Solution

The correct option is D $- 0.25 m$
Option D is correct

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