Question

When the physics teacher has given a task to determine the focal length of a concave mirror a clever boy in the class focussed the mirror to a distant object. He moved the screen in front of the mirror and caught a real image on a screen at a distance of 20 cm from the mirror and he determined the focal length. Where should the object be place so that the object and the image are formed at the same posi
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Answer 1

Answer:

your question is incomplete complete your question and send it

Answer 2

Answer:

I ............. ............

no. answer