Question

A ray is incident normally on
one side of prism. The emergent ray grazes the second face.calculate the angle of the prism(n=1.5)​

Answer 1

Answer:

Answer is here=

Explanation:

Given: A ray of light fall normally on the face of a glass prism (n=1.5).

To find the angle of prism, if the ray just fails to emerge from the second surface

Solution:

As ray of light falls normally, it goes undeviated,

So angle of refraction, r

1

=0

If the ray is not able to emerge, it means that the angle of refraction is equal to 90 degrees, and

r

2

is critical angle for prism as the refracted ray grazes the surface.

So

μ=

sinC

1

⟹sinC=

1.5

1

⟹C=sin

−1

=0.67

⟹C=41.81

∘

And Refracting angle, A=r

1

+r

2

=0+41.81=41.8

∘

is the angle of the prism.

Hope it helps you

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