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ICSE Class 10 Physics 2013 Solved Paper

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Question : 44
Total: 70
A coin placed at the bottom of a beaker appears to be raised by 4.0‌cm . If the refractive index of water is 4∕3 , find the depth of the water in the beaker.
Solution:  
Given : Shift =4‌cm,µ=‌
4
3
,
Real depth = ?
We know that Shift
‌=‌ Real depth ‌(1−‌
1
‌aµm
)
4‌=‌ Real depth ‌(1−‌
3
4
)
4‌=‌ Real depth ‌×‌
1
4
‌ Real depth ‌‌=‌
4×4
1
‌=16‌cm.
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