question_answer

  A transparent cube contains a small air bubble. Its apparent distance is 2 cm when seen through one face and 5 cm when seen through other face. If the refractive index of the material of the cube is 1.5, the real length of the edge of cube must be: [AIPMT 2000]

A)  7 cm      

B)  7.5 cm

C)       10.5 cm 

D)                   \[\frac{14}{3}\,cm\]

Correct Answer: C

Solution :

Refractive index

Refractive index

Apparent depth

So,

Real depth

or                                       (ii)

Given,

Hence,