Question

how to find the focal length of lens? explain this question in an experimental way.

Answer 1

we can find the focal length of convex lens experimental ly by u - v method
distance between lens and object is u.
distance between lens and image is v.
substitute in lens formula to get answer.

Answer 2

for this we have a special method called uv method.

where, U=object distance

           V=image distance

PROCEDURE OF EXPERIMENT

-Take a candle and place it 60cm away from a convex lens such that it lies along the PA.

- Now the most important part is adjust the screen so that you can take the readings of image distance and object distance carefully.

- Now, after getting 3 to 4 readings you can find the focal length from the mean of the values.

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