When an object is placed at a distance of 15 cm from a concave mirror, ots image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.
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answer :f = -6cm
Explanation:
object distance = -15cm
image distance = -10cm
from mirror formula
1/f = 1/v+1/u
1/f = 1/-10 - 1/15
1/f = -3-2/30
1/f = -5/30
f = -6cm
the focal length is -6cm
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