Question

Which of the following statements describes total internal reflection?(a) Returning back of the light, coming from denser medium and incident at an angle greater than the critical angle, in the same medium.(b) Returning back of the light coming from denser medium and incident at an angle less than the critical angle, in the same medium.(c) Returning back of the light coming from denser medium and incident at critical angle in the same medium.(d) Bending of light at the edge of the obstacles.

Answer 1

Answer:

If the angle of incidence is bigger than the critical angle, the refracted ray will not emerge from the medium, but will be reflected back into the medium. This is called total internal reflection. The critical angle occurs when the angle of incidence where the angle of refraction is 90°.