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Two lenses of power 6 D and – 2 D are co...

Two lenses of power 6 D and – 2 D are combined to form a single lens. The focal length of this lens will be

A

`3/2 m`

B

`1/4 m`

C

`4 m`

D

`1/8 m`

Text Solution

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The correct Answer is:
b
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