When a ray of light enters an optically denser medium, it is deviated away from normal.
When a ray of light from air enters a denser medium, it :
(a) bends away from the normal
(b) bends towards the normal
(c) goes undeviated
(d) is reflected back.
Draw a labelled ray diagram to show how a ray of light is refracted when it passes : (a) from air into an optically denser medium. (b) from an optically denser medium into air.