1.

How do you find the rough focal length of a convex lens ? Is the same method applicable to a concave lens?

Answer»

Solution :The rough focal length of a CONVEX lens is obtained by FORMING sharp image of a very distant object ona screen. The DISTANCE of the screen from the lens GIVES us the rough focal length of the lens.
This method is not applicable to a concave lens, as image formed by a concave lens is virtual and it can be TAKEN on a screen.


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