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ICSE Class 10 Physics 2019 Solved Paper

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An object is placed at a distance of 24‌cm in front of a convex lens of focal length 8‌cm.
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Question : 45
Total: 74
Calculate the distance of the image from the lens.
Solution:  
We know,
‌
1
f
‌=‌
1
v
−‌
1
u

⇒‌‌‌
1
v
‌=‌
1
f
+‌
1
u

⇒‌‌‌
1
v
‌=‌
1
8
+‌
1
−24

‌
1
v
‌=‌
1
8
−‌
1
24
‌
1
v
=‌
3−1
24
=‌
2
24
=‌
1
12

or
v=12‌cm
Thus the distance of the image from the lens is 12‌cm .
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