At what distance should an image be placed from a convex lens of focal length 12 cm to obtain an image at 30 cm from it? What will be the magnification?
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Answer:u=?
f=12cm
V=30vm
1/v-1/u=1/f
1/30-1/u=1/12
-1/u=5-2/60
-1/u=3/60
u=-20cm
now,magnification
m=v/u
m=30/60
m=1.5
Explanation:
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