Question

87. If a ray of light is going from air to glass and angle of incidence is i and angle of refraction is r we have (1) i < r (3) (sin i)/(sin r) = Cons * tan t (2) (4) sin i = sin r sin i* sin r=Constan

Answer 1

Answer:

Here, i=40∘

r=40∘-15∘=25∘

μ=

sini

sinr

 

=

sin40∘

sin25∘

 

=

0.6428

0.4226

 

=1.52

If C is critical angle for glass air interface, then from

sinC=

1

μ

 

=

1

1.52

 

=0.6579

C=sin-1(0.6579)=41.14∘.

Step-by-step explanation:

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Answer 2

41.14

Answer↑

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