postage stamp placed under glass appears raised by 8 mm if Refractive Index of a glass is 1.5 calculate the actual thickness of the glass slab
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Answer:
Correct option is C)
Refractive Index =
apparent depth
real depth
If thickness of glass block is x; real depth=x and apparent depth = x−7
⇒1.5=
x−7
x
⇒1.5(x−7)=x
⇒1.5x−10.5=x
⇒0.5x=10.5
⇒x=
0.5
10.5
=21mm
Therefore, thickness of glass block x is 21 mm or 2.1 cm.
Explanation:
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