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Q.

A thin lens made of glass of refractive index μ = 1.5 has a focal length equal to 12 cm in air.  It is now immersed in water μ=43.  Its new focal length is

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a

48 cm

b

36 cm

c

24 cm

d

12 cm

answer is A.

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A thin lens made of glass of refractive index μ = 1.5 has a focal length equal to 12 cm in air.  It is now immersed in water μ=43.  Its new focal length is