n1sin(theta1) = n2sin(theta2)
where theta2 is angle of refraction.
case1) theta1 = 30 degrees
=> 1.5*sin(30 degrees) = 1*sin(theta2)
=> theta2 = 48.59 degrees
case2) theta1 = 60 degrees
=> 1.5*sin(60 degrees) = 1*sin(theta2)
=> sin(theta2) > 1
which is not possible => light will be reflected completely.
case3) theta1 = 25 degrees
=> 1.5*sin(25 degrees) = 1*sin(theta2)
=> theta2 = 39.27 degrees
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