If AB is an incident plane wave front,then wh | vedclass

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(A) When a plane wave front is incident on a convex lens,the central part of the wave front travels through the thickest part of the lens,while the ed

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(A) When a plane wave front is incident on a convex lens,the central part of the wave front travels through the thickest part of the lens,while the edges travel through thinner parts. Since the refractive index of the lens $n_2$ is greater than the surrounding medium $n_1$,the speed of light inside the lens is lower than outside. Consequently,the central part of the wave front is delayed more than the edges. This causes the initially plane wave front to become spherical and converge towards the focal point of the lens. Therefore,the refracted wave front is a spherical wave front that is concave towards the direction of propagation (or concave towards the lens as it converges). Looking at the options,the shape that represents a converging spherical wave front is a concave curve.

If $AB$ is an incident plane wave front,then what will be the refracted wave front for a lens with refractive index $n_2 > n_1$?

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