show to rays a and b travelling from water to air . if the critical angle for water a surface is 48 degree complete the ray diagram showing the refracted rays for each state conditions when they will suffer total internal reflection
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Answer:
ANSWER
The path of each is ray is shown in the above diagram when they pass through the air-water interface.
(i) : Since the critical angle for water air surface is 48
o
. So the rays, for which angle of incidence is less than 48
o
, will get refracted at the surface. While the ray for which angle of incidence is greater than 48
o
will get total internally reflected.
Also, the given has angle of incidence exactly as 48
o
. So it grazes over the water air interface as shown.
(ii) : There are two condition for total internal reflection to occur.
(a) : The light ray must travel from denser medium to rarer medium but not vice- versa.
(b) : Angle of incidence of the ray must be greater than the critical angle. So total internal reflection of ray will occur is ∠i>48
o
.
Answer:
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