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Two thin equiconvex lenses each of focal...

Two thin equiconvex lenses each of focal length 0.2 m are placed coaxially with their optic centres 0.5m apart. Then find the focal length of the combination.

A

`-0.4 m`

B

`0.4 m`

C

`-0.1 m`

D

0.1 cm

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The correct Answer is:
A
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