a convex lens of focal length 15cm is to be used as a magnifying glass in order to produce an erect image which is 3 times magnified the distance between the object and the lens is
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f=15cm
m=v/u=3
v=3u
1/f=1/v-1/u
1/15=1/3u-1/u
1/15=-2/3u
on calculation we get u= -10cm(object distance)
m=v/u=3
v=3u
1/f=1/v-1/u
1/15=1/3u-1/u
1/15=-2/3u
on calculation we get u= -10cm(object distance)
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