Question

# An object is placed at distance of $$64 cm$$ from a white screen. By placing a convex lens at a distance of $$32 cm$$ from the object, it is found that a distinct image of the object is formed on the screen. Calculate the focal length of the lens?

Solution

## Given:$$v=32 cm$$                   $$u=-32 cm$$        (convex lens)To find: $$f$$Solution: From lens formula$$\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}$$$$\dfrac{1}{32}+\dfrac{1}{32}=\dfrac{1}{f}$$$$f=16cm$$Physics

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