In a cave 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+x1f+x2f+x1+f+x2 On solving, we get f2=x1x2 or f=x1x2
In a cave 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