(a) The speed of light ___________ when it passes from a rarer to a denser material.
(b) The speed of light ___________ when it travels from a denser to a rarer medium.
(c) Glass has a refractive index of _________ when compared to air. Air has a refractive index of 2/3 when compared to glass.
Solution :
(a) The speed of light decreases when it passes from a rarer to a denser material.
(b) The speed of light increases when it travels from a denser to a rarer medium.
(c) Glass has a refractive index of 3 / 2 when compared to air. Air has a refractive index of 2/3 when compared to glass.