Question

The second law of refraction states that :

• A. $\frac{{\sin }^{2}i}{{\sin }^{2}r}=\mu$
  
• B. $\frac{\sin i}{\sin r}=\mu$
  
• C. $\sqrt{\frac{\sin i}{\sin r}}=\mu$
  
• D. none of these are true
  

Answer 1

The correct option is B $\frac{\sin i}{\sin r}=\mu$

According to second Law of refraction, When incident ray, coming from one medium to the boundary of another medium, gets refracted, the ratio of the sine of angle of incidence i to the sine of angle of refraction r is always constant for a given wavelength of light.

This constant is the refractive index of second medium relative to the first medium.

This can be written as:

$\frac{sini}{sinr}=constant\left(\mu \right)$

This is also known as Snell's law.