A thin lens made of glass of refractive index `muu = 1.5` has a focal length equal to 12 cm in air. It is now immersed in water (`mu=4/3`). Its new focal length isA. 48 cmB. 36 cmC. 24 cmD. 12 cm

A thin lens made of glass of refractive index `muu = 1.5` has a focal

1.	A thin lens made of glass of refractive index `muu = 1.5` has a focal length equal to 12 cm in air. It is now immersed in water (`mu=4/3`). Its new focal length isA. 48 cmB. 36 cmC. 24 cmD. 12 cm
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A thin lens made of glass of refractive index `muu = 1.5` has a focal length equal to 12 cm in air. It is now immersed in water (`mu=4/3`). Its new focal length isA. 48 cmB. 36 cmC. 24 cmD. 12 cm

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