Ray Optics Test

Result

Ray Optics Test - 4

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Question 1
1 / -0

Total internal reflection takes place

A
when a ray moves from denser to rarer medium and incident angle is greater than critical angle

B
when a ray moves from rarer to denser medium and incident angle is less than critical angle

C
when a ray moves from rarer to denser medium and incident angle is equal to critical angle

D
None of the above

Solution

Total internal reflection is the phenomenon of reflection of light into a denser medium from an interface of denser medium and rarer medium. The essential conditions for total internal reflection are:

(i) Light should travel from a denser medium to a rarer medium.
(ii) Angle of incidence in denser medium should be greater then the critical angle for the pair of media in contact.

We may define critical angle fora pair of media in contact as the angle of incidence in the denser medium corresponding to which angle of refraction in the rarer medium is 90°. It is represented by C and its value depends on the nature of media in contact.

Note: In total internal reflection, 100% of incident light is reflected back into the same medium, and there is no loss of intensity. That is why images formed by total internal reflection are much brighter than those formed by mirrors or lenses.