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प्रश्न
When a parallel beam of paraxial light strikes a concave spherical mirror, the reflected rays:
विकल्प
converge to a single point
appear to diverge from a single point
continue travelling parallel to one another
scatter randomly in all directions
MCQ
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उत्तर
A concave mirror causes a parallel paraxial beam to converge to a single point after reflection — this point is the Principal Focus. The reflected rays do not scatter randomly; they meet at the focus in front of the mirror.
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