The image of a distant objects is formed at 20 cm from a concave mirror. what is the focal length of the mirror.
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Explanation:
1/v + 1/v = 1/f.
If u = -∞ then v = f
So given v = -20 cm. So f = -20 cm.
A point Image is formed at the focus.
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Convex mirror:
1/u + 1/v = 1/f
given u = -∞
1/v = 1/f
of v= f. f is positive. Image is behind the mirror.
When object is at infinity, then a point image (erect) at the focus is formed.
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The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.
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