Question

Total internal reflection can occur:

1,When a light ray strikes a surface parallel to the normal
2,When light moves into a material where it will travel with a slower speed
3,When the refracted ray bends toward the normal
4,When light travels from a material with higher refractive index into a material with lower refractive index

Answer 1

⏺heya friend !

✔here's your answer :-

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⚫Total internal reflection can occur:
When light travels from a material with higher refractive index into a material with lower refractive index.

⚫hence, option 4 is correct.

⚫this is because the second medium should be of lower refractive index than the first medium or you can say light should travel from denser to rarer medium.

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i hope it helps u !!!☺