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The focal length of lens of refractive i...

The focal length of lens of refractive index `1.5` in air is `30 cm` When it is immersed in water of refractive index `(4)/(3)` ,then its focal length will be

A

0.15 m

B

0.30 m

C

0.45 m

D

1.20 m

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The correct Answer is:
D
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