Question

Select the most appropriate word from the given box and fill in the following blanks.

normal 48.6° ray red refractive index vacuum 41° refraction 2.3

When a ray of light travels from one optical medium to another optical medium normally, it suffers no ______.

Answer 1

When a ray of light travels from one optical medium to another optical medium normally, it suffers no refraction.

Explanation: 

For normal incidence, the angle of incidence is zero degrees ($i = 0^\circ$), which means the angle of refraction is also zero degrees ($r = 0^\circ$). Therefore, the light ray passes without any bending or refraction.