One face of a prism of refracting angle 30

Asked by admin @ 20/08/2021 in Physics viewed by 322 People

One face of a prism of refracting angle 30° and refractive index 1.414 is silvered at what angle must a ray of light face on the unolivered face so that after refraction into the prism and reflection at the silver surface it retraces the path

Answered by admin @ 20/08/2021

Solution :

given A=30∘

μ=1.414

i2=0∘

because the refracted ray retracts its path

r2=0

r1+r2=A

r1+0=A

r1=30∘

μ=sini1sinr1

1.414=sini1sin30

sini1=1.414×12

=0.707

i=45∘

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