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Sudha finds out that a sharp, real image of the window pane of her science laboratory is formed at a distance of $15 cm$ from a lens. The approximate focal length of this lens is ____ $cm$ .

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Detailed Solution

Sudha finds out that a sharp, real image of the window pane of her science laboratory is formed at a distance of

15 cm

from a lens. The approximate focal length of this lens is

15 cm .

The lens used is convex since the image created is real. We know that light rays coming from infinity meet at the focus of a convex lens. The approximate focal length of the lens is

15 cm

, as the rays of light coming from the window pane are considered to come from infinity.

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