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Two identical thin plano convex glass le...

Two identical thin plano convex glass leses (refractive index 1.5) each having redius of curvature of 20cm are placed with their convex surface in contanct at the centre. The intervening space is filled with oil refractive index 1.7. The focal length of the combination is

A

`-25` cm

B

`-50 cm`

C

50 cm

D

`-20` cm

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The correct Answer is:
B
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