Question

what is principal focas
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Answer 1

Also called: principal focus, focus. the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection. 2. a central point of attention or interest.

Answer 2

Answer:

The point on principal axis on which light rays after refracting from a lens or reflecting from mirror meets or appears to meet is called pricncipal focus of lens or mirror.