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Q.

Statement - I :The geometrical shape of the wave front when a plane wavefront passes through a convex lens will be again plane wave front
Statement - II :When a plane wave front is reflected by a concave mirror, it remains as plane wavefront.

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a

Both statements I and II are correct

b

Statement-I is incorrect and statement-II is correct

c

Both statements I and II are incorrect

d

Statement-I is correct and statement-II is incorrect

answer is D.

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Detailed Solution

A convex lens is a converging lens. As the wave passes through the lens, they get converged towards the focus. So, the wavefront will be of the shape of converging spherical surfaces as the wave is refracted from the lens. Plane wave front after reflection from concave mirror, turned into spherical wave front.

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Statement - I :The geometrical shape of the wave front when a plane wavefront passes through a convex lens will be again plane wave frontStatement - II :When a plane wave front is reflected by a concave mirror, it remains as plane wavefront.