PQ (Double arrow ray) and PR (Single arrow ray) are two light rays emerging from the object P as shown in the figure below:
The position of image of the object P when seen obliquely from above will be
Obliquely above P in water
Vertically above P in water
Vertically above P in air
Obliquely above P in air
What is the special name given to the angle of incidence (angle PQN) of ray PQ?
In Fig. 4.63, 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 ∠PQN of the ray PQ.
(b) What is the angle of refraction for the refracted ray QS?
(c) Name the phenomenon that occurs if the angle of incidence ∠PQN 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 image of the object P by the letter P' when seen vertically from above.
Name the phenomenon that occurs if the angle of incidence (angle PQN) is increased still further.