Question:
An object 2 centimetre high is placed at a distance of 20 centimetres from a concave mirror. A real image is formed at 40 centimetre from the mirror. Calculate the focal length of the mirror.
Answer:
We know that 1/f = 1/u + 1/v
In the above problem, u = -20 m; v = -40 m
Hence, 1/f = -1/20 -1/40 = -3/40
f = -40/3 = -13.33m
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