Question

A postage stamp appears raised by 7.00 mm when placed under a glass block of refractive index 1.5. Find the thickness of the glass block. ​

Answer 1

Answer:

$Refractive index = real / apparent depth Let real depth be ( x ) therefore apparent depth will be ( x - 7mm) given refractive index is 1.5 therefore >1.5 = x/ (x-7mm) >1.5x - 10.5 =x. ie 1.5(x - 7mm) >1.5x - x = 10.5 > 0.5x = 10.5 > x = 10.5/ 0.5 = 2.1 therefore answer is 2.1 cm</p><p></p><p>$

Explanation:

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