The focal length of lens of refractive index 1.5 in air is 30 cm. Wh – McqOptions

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1.	The focal length of lens of refractive index 1.5 in air is 30 cm. When it is immersed in a liquid of refractive index \[\frac{4}{3}\], then its focal length in liquid will be [BHU 2002]
A.	30 cm
B.	60 cm
C.	120 cm
D.	240 cm
Answer» D. 240 cm

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