56 A glass of convex lens( refractive index of glass = 1.5) has a focal length of 8 cm when placed in air. What would be the focal length of the lens when it is immersed in water ( refractive index of water = 1.33)? A 2m B 4cm. C 16cm D 32cm.

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Q. A convex lens of refractive index

1.5

has a focal length of

18 c m

in air. Calculate its focal length when it is immersed in water of refractive index

\frac{4}{3} . t a k e f_{1} = 18

Q. A thin lens of refractive index

1.5

has a focal length of

15 c m

in air. When the lens is placed in a medium of refractive index

4 / 3

, its focal length will becomes _______ cm.

Q. A glass convex lens has a focal length of

20

cm in air. What will be its focal length, when it is completely immersed in a liquid of refractive index

1.63

? ( Given

_{a} μ_{g} = 1.5

)

Q. A convex glass lens

(μ_{g} = 1.5)

has a focal length of 8 cm when placed in air. What is the focal length lens when it is immersed in water?

(μ_{ω} = \frac{4}{3})

A convergent lens made of crown glass (refractive index 1.5) has focal length 20cm in air. If it is immersed in a liquid of refractive index 1.60, its focal length will be:

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