Question

An equilateral glass prism under minimum deviation condition has an angle of incidence 40°. Finds it's refractive indec with Proper explanation​

Answer 1

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12th

Physics

Ray Optics and Optical Instruments

Prism

A ray of light suffers a mi...

PHYSICS

A ray of light suffers a minimum deviation when incident on an equilateral prism of refractive index 2. The angle of incidence is :

A .

30o

B .

45o

C .

60o

D .

50o

October 15, 2019Hitesh Rajmohan

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VIDEO EXPLANATION



ANSWER

Given :   Refractive index of air, n1=1         Refractive index of prism, n2=2

Angle of prism, A=r1+r2

As ray of light suffers minimum deviation, thus  r1=r2=r

⟹  A=2r

∴   r=2A=260o=30o  

                 where A=60o  (equilateral prism)

Using Snell's law, n1sini=

I hope it helps you to understand.