How can you find out the focal length of concave mirror experimentally

1.	How can you find out the focal length of concave mirror experimentally when there is no sunlight?
Answer» Place the object / candle in front of the mirror and adjust the screen to get image on it. Measure the object distance, image distance. Substitute the values (as per sign connection) in mirror formula (1/f) = (1/u) + (1/v). We get the focal length of mirror. (OR) Place the object / candle and the screen at same point in front of the mirror. Adjust this set of material to get sharp image on the screen. Measure the distance from mirror to object/screen. This distance is the radius of curvature and make it half, it gives focal length of the mirror.

How can you find out the focal length of concave mirror experimentally when there is no sunlight?

Answer»

Place the object / candle in front of the mirror and adjust the screen to get image on it. Measure the object distance, image distance. Substitute the values (as per sign connection) in mirror formula (1/f) = (1/u) + (1/v). We get the focal length of mirror.

(OR)

Place the object / candle and the screen at same point in front of the mirror. Adjust this set of material to get sharp image on the screen.

Measure the distance from mirror to object/screen. This distance is the radius of curvature and make it half, it gives focal length of the mirror.

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