Advertisements
Advertisements
Question
Name any two phenomena which take place in the formation of a rainbow.
Solution
The formation of a rainbow involves all three phenomena: Refraction, Dispersion and Total internal reflection.
APPEARS IN
RELATED QUESTIONS
The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P are shown up to the water surface
1) Show in the diagram the path of these rays after striking the water surface.
The Critical Angle for the water-air surface is 48°.
2) Name the phenomenon which the rays B and D exhibit.
Plot a graph between
Angle of incidence versus angle of refraction.
Express the refractive index μ of a medium in terms of the angle of incidence i in air and the angle of refraction r in a denser medium.
Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.
PQ and PR are two light rays emerging from the object as shown in the figure below:
(i) What is the special name given to the angle of incidence (∠PQN) of ray PQ?
(ii) Copy the ray diagram and complete it to show the position of the image of the object P when seen obliquely from above.
(iii) Name the phenomenon that occurs if the angle of incidence ∠PQN is increased still further.
Answer the following question.
Define the critical angle of incidence and obtain an expression for it.
Answer the following question.
Describe the construction and working of an optical fibre.
For the same angle of incidence, the angle of refraction in four media A, B, C and D are 25°, 30°, 35° and 40° respectively. The speed of light is least in medium ______.
What is the phenomenon used in optical fiber? Explain.
The diagram below shows a fish in the tank and its image seen in the surface of water.
Name the phenomenon responsible for the formation of this image.