Question

Which of the following statements about total internal reflection is true? a) angle of incidence should be greater than critical angle b) light must travel from a medium of higher refractive index to a medium of lower refractive index c) both (a) and (b)

Answer 1

The right option is c.

Both statements are equally correct and required for the total internal reflection to happen.

When the angle of incident is equal to highest its value which is 90◦, it is known as the critical angle.

When the angle of incident is greater than the critical angle, the light will not pass the surface and it will be reflected internally.

This is called as total internal reflection.

You can further read on,

http://www.physicsclassroom.com/class/refrn/Lesson-3/Total-Internal-Reflection.

Answer 2

HEY!!

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⚫Both the statements are true that "angle of incidence should be greater than critical angle" and "light must travel from a medium of higher refractive index to a medium of lower refractive index"

⚫So c option will be correct