Focal length of thin lens of refractive ...

Focal length of thin lens of refractive index 1.5 is 15 cm. When placed on liquid of refractive index `4/3`, then its focal length will be ...... cm.

80.31

78.23

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The correct Answer is:

Focal length in liquid = 4 `xx` focal length in air
`=4xx15=60` cm

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