an object 1 m tall is placed on the convex lens and its 40 cm tall image is formed on a screen placed 70 cm from the object find the focal length
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Answer:
f=25.5
Explanation:
1/v-1/u=1/f.
v=40
u=-70
f=
1/40-1/-70=1/f
1/40+1/70=
70+40/2800
110/2800
1/25.5=1/f
f=25.5
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