question_answer

A small air bubble is situated in a cube of 24 cm edge when viewed from one face, it appear to be 10 cm from the surface and through the opposite face is 6 m from the surface. Then the refractive index of the material of the cube is

A)  1.6                                        

B)  1.5

C)  1.3                                        

D)  1.4

Correct Answer: B

Solution :

                 Refractive index \[(\mu )\]is defined as ratio of real depth upon apparent depth.                                                 \[\therefore \]  Real depth = 24 cm, apparent depth = 10 + 6 = 16 cm \[\therefore \]  \[\mu =\frac{24}{16}=1.5\]