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A ray of light travels from an optically...

A ray of light travels from an optically denser to rarer medium. The critical angle of the two media is C. The maximum possible deviation of the ray will be

A

`90^(@)`

B

`sqrt(90^(@) + C)`

C

`90^(@) - C `

D

`90^(@) - 2 C `

Text Solution

Verified by Experts

The correct Answer is:
C

From the figure we find that when i= C , `r = 90^(@)` and the refracted ray `vec(OR)` is parallel to the surface .
The incident ray `vec(PQ)` is deviated through an angle Q'OR in the rarer medium and for the critical angle , the deviation is maximum
`therefore Q'OR = delta = 90^(@)- C therefore delta = 90^(@) - C `
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