Question

please tell fast please​

Answer 1

Answer:

Hold a concave mirror in your hand and direct it towards the sun.

Direct the light reflected by the mirror on to a sheet of paper held close to the mirror.

Move the sheet back and forth slowly until a bright, sharp spot of light is seen on the paper

Explanation:

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Answer 2

Answer:

Focal length of concave mirror is concave mirror

Concave mirror