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Explain the refraction of plane wavefron...

Explain the refraction of plane wavefront of light in a concave mirror.

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In the figure , AOB represents a plane wavefront . A'O'B' represents a converging spherical wavefront and XPX' represents a concave mirror. The time of travel of a beam AX and BX' will be the same and shorter than for the light beam OP. Thus the emergent wavefront is converging spherical wavefront.
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