In a concave mirror experiment, an object is placed at a distance x1 from the focus and the image is formed at a distance x2. from the focus. The focal length of the mirror would be
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a
x1x2
b
x1x2
c
x1+x22
d
x1x2
answer is B.
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Detailed Solution
Given u=(f+x1) and v=(f+x2) The focal length f=uvu+v=(f+x1)(f+x2)(f+x1)+(f+x2) on solving, we get f2=x1x2 or f=x1x2
In a concave mirror experiment, an object is placed at a distance x1 from the focus and the image is formed at a distance x2. from the focus. The focal length of the mirror would be