Question 29 Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.
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Solution
(i) When a ray of light enters from air (rarer medium) into water (denser medium), the ray of light bends towards the normal. (ii) When a ray of light enters from water (denser medium) into air (rarer medium), the ray of light bends away from the normal.
Note: The dotted line shows the undeviated path of light, in case if the light would not have undergone refraction.