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A student obtained on a screen a sharp image of a candle flame placed at the farther end of a laboratory using a concave mirror. For getting better value

of focal length of the mirror, the teacher suggested him to focus the sun. what should the student do


As the teacher asked him to focus the sun on the screen he must find out the focal length of the mirror.
For doing so he must first set the screen at such a position that he is able to see a bright dot of sun on the screen. For finding out the correct focal length he must adjust the screen till he sees the brightest light on screen.
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