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ACB is right-angled glass prism of refra...

ACB is right-angled glass prism of refractive index 1.5 . `/_A` ` /_B` and `/_C` are `60^@` ` 30^@` and `90^@` respectively.A thin layer of liquid is on the AB. For a ray of light which is incident normally on AC to be totally reflected at AB the refractive index of the liquid on AB should be

A

1.5

B

1.4

C

1.3

D

1.2

Text Solution

Verified by Experts

The correct Answer is:
D
`i_(1)=r_(1)=0^@,r_(2)=0^@` but `r_(2)=c`
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