A spherical mirror converges parallel rays to the principal focus. As the rays come in parallel to the principal axis, they get reflected from these spherical surfaces and form a diminished image in the focus of the mirror, either in front of it or the back.
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Answer:
A spherical mirror converges parallel rays to the principal focus. As the rays come in parallel to the principal axis, they get reflected from these spherical surfaces and form a diminished image in the focus of the mirror, either in front of it or the back.