Question

Mention any two situation in which snells law fails

Answer 1

At the point of total internal reflection.When the sin of the angle of reflection is greater than one.

For the normal incidence of light on a refractive surface angle of refraction r =0
But according to snell's law
sin i /sin r = n (refractive index)
i.e, denominator becomes zero which is a indeterimant form
like in diamond once the ray of light enters it,it doesn't come out this is known as total internal reflection and the angle is called as critical angle of reflection!

Hope this helps.......

Answer 2

Hi friend,

Two situation in which snells law fails are:-

-» When TIR(total internal reflection) takes place at an angle greater than the critical angle.

-» When light is incident normally on a surface, as i =0,r =0 thus not applicable.

HOPE THIS HELPS YOU:-))