ICSE Class 10 Physics 2020 Solved Paper | Question 39

ICSE Class 10 Physics 2020 Solved Paper

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A lens of focal length 20‌cm forms an inverted image at a distance 60‌cm from the lens.

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Question : 39

Total: 67

How far is the lens present in front of the object?

Solution:

Given : f=+20‌cm,v=+60‌cm
We know, ‌

1

f

=‌

1

v

−‌

1

u

⇒‌‌‌

1

20

=‌

1

60

−‌

1

u

⇒‌‌‌

1

u

=‌

1

60

−‌

1

20

⇒‌‌‌

1

u

=‌

1−3

60

=‌

−2

60

⇒‌‌‌

1

u

=‌

−1

30

or ‌‌u=−30‌cm.
∴ The lens is present in front of the object at a distance of 30‌cm from it.

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