an object placed at a distance of 25cm from a casts a real image at 40cm from its pole find the focal length
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Answer:
given
object distance u = -25cm
image distance v = -40cm ( as the image formed is real thus its on the left side of the mirror)
We know 1/f = 1/v + 1/u
=> 1/f = 1/-40 + 1/-25
=> 1/f = -0.065
f = 15.38D
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