Question

why does a concave mirror have a real principal focus, while a convex mirror has a virtual principal focus?

Answer 1

Hello Saadimalik ,

Focus is a point where light rays appears to meet. It is called real focus when there is actual intersection of light as in case of concave mirrors.

While in the case of convex mirror light rays are drawn back to meet at a point.

Therefore Concave mirrors have a real focus as it is formed by real intersection of light rays. You can get a clear understanding by seeing the diagram which is attached.

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Answer 2

Hope it helps

Pls refer the attachment

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