Light enters from air to glass having refractive index (1.50). What is the speed of light in the glass? The speed of light in a vacuum is (3 × 10⁸ , m/s).

a) (2 × 10⁸ , m/s)
b) (2.5 × 10⁸ , m/s)
c) (2.8 × 10⁸ , m/s)
d) (3 × 10⁸ , m/s)