an object of is stuck on hhe surface of a transparent solid sphere of radius 20 cm . fimf refractive index of the sphere such that rays from rom the object of the refraction from the opposite side emerge as a parell beam
an object of is stuck on hhe surface of a transparent solid sphere of radius 20 cm . fimf refractive index of the sphere such that rays from rom the object of the refraction from the opposite side emerge as a parell beam