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प्रश्न
A postage stamp placed under a glass, appears raised by 8 mm. If refractive index of glass is 1.5, calculate the actual thickness of the glass slab.
संख्यात्मक
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उत्तर
Let the real thickness of glass = x mm
∴ Apparent thickness = (x − 8) mm
\[ \text{We know, } \mu = \frac{\text{Real depth}}{\text{Apparent depth}}\]
\[1.5 = \frac{x}{x - 8}\]
⇒ 1.5 x − 12 = x
⇒ x = 24 mm
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