Question

For a ray of light going from a denser medium to rarer medium, what is the value of refractive index of the medium if the critical angle is equal to ${45}^o$ ?

• A. 1.341
• B. 1.414
• C. 1.515
• D. 1.5

Answer 1

The correct option is B 1.414

Refractive index of the medium,
$$n=\frac{1}{sinC}$$
where, C is the critical angle and $C={45}^o$
$$n=\frac{1}{sin{45}^o}=\frac{1}{1/\sqrt{2}}$$$$n=\sqrt{2}=1.414$$