HERE,
object distance u = 60 cm
focal length f = 20 cm ,
we know
\(\frac1f=\frac1u+\frac1v\)
1/ v = 4/ -60
v = -15 cm
similarly,
magnification = v/u = 15/60 = 1/4 = 0.25
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An object is placed at 60cm , concave lens focal length is 20cm. find image and magnification.
HERE,
object distance u = 60 cm
focal length f = 20 cm ,
we know
\(\frac1f=\frac1u+\frac1v\)
1/ v = 4/ -60
v = -15 cm
similarly,
magnification = v/u = 15/60 = 1/4 = 0.25
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