ICSE Class 10 Physics 2014 Solved Paper

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Question : 40
Total: 66
The lens mentioned in 6(b) above is of focal length 25‌cm. Calculate the power of the lens.
Solution:  
Given : f=25‌cm=0.25m
Power of lens (in D)
‌=‌
1
‌ Focal length (in metre) ‌

‌=‌
1
0.25
=‌
100
25
=4D.
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