1.

When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is (a) (x+y)/2 (b) x – y(c) √xy (d) x + y

Answer» When an object is at distance x and y from a lens, a real image and a virtual image is formed respectively having some magnification. The focal length of the lens is

(a) (x+y)/2 (b) x – y

(c) √xy (d) x + y


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