define:1.focus of a convex lens 2.focus of concave lens

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Solution

It is a point on the principal axis of a lens(convex or concave)where parallel beam of light rays, travelling parallel to principal axis, after passing through the lens actually meet.

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What is the difference between focus and principal focus of concave and convex lenses

(a) Explain with the help of a diagram, why the concave lens is also called a diverging lens. (b) Define the principal focus of a concave lens.

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