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(B) $1$. $A$ point source of light emits light in all directions, forming spherical wavefronts as the light propagates outward.$2$. When these spheric

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spherical, planar

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(B) $1$. $A$ point source of light emits light in all directions, forming spherical wavefronts as the light propagates outward.$2$. When these spherical wavefronts strike a concave mirror, the rays are reflected parallel to the principal axis (for paraxial rays).$3$. $A$ set of parallel rays corresponds to a plane wavefront.$4$. Therefore, the incident wavefront is spherical, and the reflected wavefront is planar.

$A$ point source of light is placed at the focus of a concave mirror. Consider only paraxial rays. The shapes of the wavefronts of incident and reflected lights respectively are

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