In figure, PQ and PR are the two light rays emerging from an object P. the ray PQ is refracted as QS. (a) state the special name given to the angle of incidence anglePQN for the ray PQ. (b) What is the angle of refraction for the refracted ray QS? (c) Name the phenomenono that occurs if the angle of incidence anglePQN is increased. (d) The ray PR suffers partial reflection and refraction on the water-air surface. give reason. (e) Draw in the diagram the refracted ray for the incident ray PR and hence show the position of the image of the object P by the letter P' when seen vertically from above.

In figure, PQ and PR are the two light rays emerging from an object P.

1.	In figure, PQ and PR are the two light rays emerging from an object P. the ray PQ is refracted as QS. (a) state the special name given to the angle of incidence anglePQN for the ray PQ. (b) What is the angle of refraction for the refracted ray QS? (c) Name the phenomenono that occurs if the angle of incidence anglePQN is increased. (d) The ray PR suffers partial reflection and refraction on the water-air surface. give reason. (e) Draw in the diagram the refracted ray for the incident ray PR and hence show the position of the image of the object P by the letter P' when seen vertically from above.
Answer» Answer :(a) critical angle (b) `90^(@)` (C) Total internal REFLECTION (d) For the RAY PR, angle of incidence is LESS than `angle PQN` (i.e., the critical angle).