Assertion (A) : Focal length of a convex lens remain same when it is immersed in water. Reason (R ) : The refractive index of the material of the lens does not depend on the nature of the medium.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false
(d) A is false and R is also false
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(c) is the answer
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