For a convex lens object is placed at a distance 7.5 it's image is found at10cm from the lens the focal length of the lens will be
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Answer:
4.2cm
Explanation:
Given: u=-7.5cm v=10cm
As it is a convex lens, 1/v-1/u=1/f
1/10-(-1/7 5)=1/10+1/7.5=7.5+10/75=
175/750.
f=750/175 =4.2cm.
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