wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A light ray is incident on an inclined glass-air interface as shown. The largest angle ϕ for which the light ray is totally reflected at the surface AC is -


Open in App
Solution


For TIR at surface AC,
iθc

In critical case,
i=θc

But, i=90ϕ [from geometry]

So, largest value of angle ϕ for TIR at surface AC is for i=θc

So, from Snell's law at surface AC, for i=θc

μ1sini=μ2sinr

1.5sin(90ϕmax)=1×sin90

cosϕmax=23

ϕmax=cos1(23)
Hence, option (a) is correct.
Why this question ?
This question is for testing the concept of total internal reflection and Snell's law

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon