siwalaxmi siwalaxmi

15-03-2021
Physics

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what is principal focus and focus length with examples

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sevdaretl06 sevdaretl06

15-03-2021

Explanation:

Principle focus is the point on the axis of a convex lens, where the parallel rays of light from one side of the lens. meet on other side after refraction. Distance between optical centre to principle focus point is the focal length.

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