A beam of light is converging towards a point 1. A plane parallel plate of glass of thickness t, refractive index µ is introduced in the path of the beam. The covergent point is shifted by (assume near normal incidence) :
(a) t (1 – 1/µ) away
(b) t (1 + 1/µ) away
(c) t (1 – 1/µ) nearer
(d) t (1 + 1/µ) nearer