# Que 1st and 2nd with explanation. 1.  A ray incident at point B at an angle of  incidence $\theta$ enters into a glass sphere and is reflected and refracted at the farther surface of the sphere, as shown.  The angle between the reflected and refracted rays at this surface is 90$°$ .  If refractive index of material of sphere is $\sqrt{3},$ the value of $\theta$ is 2.  Light in incident from glass $\left(\mu =1.5\right)$ to water $\left(\mu =\frac{4}{3}\right)$.  Find the range of deviation for which there are two angle of incidence.

Dear Student ,
2. Answer of the question 2 is given below .Kindly ask different question in different posts .

Here, if the angle of incidence is increased beyond critical angle, total internal reflection occurs and deviation decreases. So, the range of deviation is 0 to cos–1(8/9).

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