question_answer

A light passing through air has wavelength \[6000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]. The wavelength when same ray passes through a glass slab of refractive index 1.5 will be:

A) \[2000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]                         

B)        \[4000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]         

C)        \[8000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]                                         

D)        \[1200\overset{\text{o}}{\mathop{\text{A}}}\,\]

Correct Answer: B

Solution :

When light ray passes through a glass slab, then new wavelength \[\lambda =\frac{\lambda }{\mu }=\frac{6000}{1.5}\]    x