Question

can u answer this?..........................​

Answer 1

Yes I can answer it.... : )

Well...

..

Snell's law... of refraction..... "

1 sin i = μ sin r (where i is seen in the figure as 60*)

now, when the ray retraces its path..... angle of incidence= reflection = 90*

and when we find all the angles of the triangle formed ...  we get 90-r = 60

=> r =30

so

sin 60 = μ sin 30

√3/2 =  μ 1/2

=>  μ = √3

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Cheers :)