Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • The angle of a prism is 'A'. One of its reflecting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after sufferi

The angle of a prism is 'A'. One of its reflecting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index \mu, of the prism is:

Option: 1

2\sin A


Option: 2

2\cos A


Option: 3

\frac{1}{2}\cos A


Option: 4

\tan A


Answers (1)

best_answer

To retrace its path light rays should fall normally on the reflecting surface. So
r2=0 .

$\Rightarrow r_{1}=A-r_{2} \Rightarrow r_{1}=A$
Now applying snell rule between incident ray and refracted ray.


$(1) \sin (2 A)=n \sin (A) \\ \Rightarrow 2 \sin A \cos A=n \sin A$ $\Rightarrow n=2 \cos A$

Posted by

Rishabh

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

NEET paper solver gang busted in Delhi, four held
anam-khan

PIL in Patna HC seeks CBI probe into ‘NEET paper leak case’, cancellation of exam
anam-khan

NEET UG 2024: SC refuses to stay result declaration over alleged paper leak

Latest Question