Question

how many principal focus in convex lense?

Answer 1

A convex lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point called theprincipal focus. The distance between the principal focus and the centre of the lens is called the focal length

what is principal focus of lens ?
answer=focal point. n. 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.

Answer 2

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