An object is placed at 20 cm from the pole of a concave mirror. It forms real image at a distance of 60 cm from the pole. Find the focal lenght of concave mirror.
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2
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80 cm pole this is right answer.
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24
Answer:
In the given problem,
Object distance, u = – 20 cm (using Cartesian sign convention)
Image distance, v = – 60 cm (using Cartesian sign convention for real image)
Focal length of the mirror is given by,
1/f = 1/u + 1/v
1/f = –1/20 + –1/60
1/f = –(60 + 20)/60 × 20 = –80/1200
f = –1200/80 = –15 cm.
Therefore, the focal length of the given concave mirror is 15 cm.
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