Question

how do you find the focal length of a concave mirror by shortcut method
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Answer 1

Answer:

1. face the concave mirror to the sun
2. now adjust a piece of paper Infront of the mirror
3. move the paper till you get a bright intense spot if the sun
4. this is the focal point of the mirror
5. now measure the distance
6. this is the focal length of the concave mirror