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Explain the refraction of a plane wavefront with a thin convex mirror. |
Answer» Solution : Figure shows the PLANE wavefront XY of a parallel BEAM of light incident to a thin convex lens and rays coming out through the thin convex lens is shown to be concentrated at second focus point. To draw a wavefront corresponding to these rays, the circles should be drawn by accepting second focus as a centre. The arc X.Y. of such circles is shown in the figure. This arc is the wavefront corresponding to the refracted rays at some instant. Here the distances from A to a and C to care greater then B to b. So the light has taken more DISTANCE in the lens going for B to b and the velocity of light in the material of lens is less. Hence, the point b on the wavefront LAGS behind a and c. |
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