Question

Hiii...


How can we find the rough or approximate focal length of concave lens ?


Plzzz answer briefly..

Plzzzz help guys..♡♡​

Answer 1

Answer:

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Hold the concave mirror facing some distant object like a tree. Hold a cardboard screen in front of the mirror. Adjust the position of the screen so that a sharp image of distant object is formed on the screen. The distance of screen from the mirror gives us the approximate focal length of the concave mirrror.

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Answer 2

Explanation:

Hold the concave mirror facing some distant object like a tree. Hold a cardboard screen in front of the mirror. Adjust the position of the screen so that a sharp image of distant object is formed on the screen. The distance of screen from the mirror gives us the approximate focal length of the concave mirrror.