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Cutting of Thin Lenses

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Does the focal length of a lens change when placed in water and if yes then why

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What will happen to the focal length of a concave mirror, convex mirror, concave lens and convex lens when immersed in water? will it change ? if yes explain .

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Complete the following sentences :

(a) If half of a convex lens is covered, the focal length ..................... change, but the intersity of image ......................

(b) A convex lens is placed in water. Its focal length will ..................

(c) The focal length of a thin convex lens is ............... than that of a thick convex lens.

Q. A convex lens made up of glass

(μ_{g} = 1.5)

When placed in air has a focal length 4cm, if it is immersed in water

(μ_{w} = 1.33)

then what will be its focal length in water:

Q. Assertion :The focal length of lens does not change, when red light is replaced by blue light. Reason: The focal length of lens does not depends on colour of light used.

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