3. An object is 0.09m from a magnifying lens and the image is formed 36cm from the lens. The magnification produced is ________.(calculations to be shown)
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Answer:
Correct option is
A
20 cm
From Lens maker's formula,
f
1
=(μ−1)(
R
1
1
−
R
2
1
)
r
1
=20cm,R
2
=−R
1
=−20cm
∴
f
1
=(1.5−1)(
20
1
+
20
1
)
=0.5(
10
1
) or f=20cm
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