1.

The image is direct and is above principal axis an object is kept at a distance of 30 cm away from a lens. An image of same size is formed. What is the focal length of the lens?

Answer»

Image of size is formed when the object is kept at 2F

\(\therefore\) 2f = 30 cm

\(\therefore\) f = 15 cm

\(\therefore\) 30/2 = 15 cm



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