A ray of light passes from air to glass. No refraction of light occurs if the ray of light hits the boundary of medium of glass at an angle of

Q. A ray of light passes from a medium L to a medium K. No refraction of light occurs if the ray of light hits the boundary of these two media at the angle of incidence equal to ...............

Q.

No refraction occurs when the light ray incident is ___ a boundary of two medium.

Q. Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:

(a) if it hits the glass block at 90° (that is, perpendicular to the glass block)
(b) if it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).

Q. A ray of light is incident at ${60}^{\circ }$, on glass-air interface. Then the light ray will ___. (Given: Incident ray lies in glass).
Use : [${\mu }_g$ = $\sqrt{2}$ , ${\mu }_a$ = 1]