Question

a ray of light from a denser medium strikes a rare medium at an angle of incidence as shown in figure the reflected and refracted rays makes an angle of 90 degree with each other the angles of the reflection and refraction r r and a dash the critical angle is

a)sin-1(tan r)
b)sin-1(tan I)
c) sin-1(tan r')
​

Answer 1

Answer:

Explanation:

as the reflected and refracted rays are 90 then the angle of refraction is 90−i

according to Snell's law

siniμ  

r

​  

=sin(90−i)

μ  

r

​  

=coti

critical angle is sin  

−1

 

μ  

r

​  

 

1

​  

=sin  

−1

 

coti

1

​  

=sin  

−1

tani

HOPE THE ANSWER IS HELPFUL

Answer 2

Answer:

tell a lie carefully

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