At what value of the angle of incident α1 is a beam of light reflected from the surface of
water perpendicular to the refracted beam? Assume n is the refractive index of the
refracting medium.
it is urgent plzz..... :)
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12th
Physics
Ray Optics and Optical Instruments
Refraction of Light and Laws of Refraction
As shown in above figure, a...
PHYSICS
As shown in above figure, a beam of light in air is incident upon the smooth surface of glass 30
o
with glass surface. Calculate the refractive index of the glass if the reflected beam and refracted beam are perpendicular to each other.
qu
From figure, i=90
o
−30
o
=60
o
And, from law of reflection , angle of reflection=r=i=60
o
Since, reflected and refracted ray are normal,
hence,
r+R+90
o
=180
o
where R= angle of refraction
⟹R=90
o
−r=90
o
−60
o
=30
o
From Snell's Law:-
μ=
sinR
sini
=
sin30
o
sin60
o
⟹μ=
3
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