Advertisements
Advertisements
Question
Which of the following is not involved in formation of a rainbow?
Options
refraction
angular dispersion
angular deviation
total internal reflection
Advertisements
Solution
Angular deviation
Explanation:
A rainbow is created when raindrops that are suspended in the air scatter sunlight. We perceive a rainbow because of the way light refracts when it enters a raindrop, total internal reflection from the rear of the droplet surface, and further refracted out in the atmosphere. So all the given processes, i.e., total internal reflection, refraction, and dispersion, take place in the rainbow formation. Angular deviation of light doesn't occur in the formation of a rainbow.
APPEARS IN
RELATED QUESTIONS
A ray of light travels from water to air as shown in the diagram given below :
1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.
2) State the condition so that internal reflection occurs in the above diagram.
Name the factors affecting the critical angle for the pair of media.
What is total internal reflection?
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles].
How does a ray of light bend when it travels from when it is normal to the interface of the two media.
Can light be ‘piped’ like sound in a doctor’s stethoscope?
If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media (angle I is not 0)?
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.
The diagram shows a point source P inside a water container. Three rays A, B, and C starting from P are shown up to the water surface. Show in the diagram the path of these rays after striking the water surface. The critical angle for the water-air pair is 48°.
Complete the following diagram to show the path of the ray of a single colour in the diagram as if enters in and emerges out of the prism. Mark the angles wherever necessary. (Critical angle for glass = 42°).
A ray of light is incident as a normal ray on the surface of separation of two different mediums. What is the value of the angle of incidence in this case?
Explain ‘mirage’ as an illustration of refraction.
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
Answer the following question.
What are the advantages of optical fibre communication over electronic communication?
Solve Numerical example.
A monochromatic ray of light is incident at 37° on an equilateral prism of refractive index 3/2. Determine angle of emergence and angle of deviation. If angle of prism is adjustable, what should its value be for emergent rays to be just possible for the same angle of incidence?
The resultant `vec"R"` of `vec"P"` and `vec"Q"` is perpendicular to `vec"P"`. Also `|vec"P"|=|vec"R"|`. The angle between `vec"P"` and `vec"Q"` is ______.
[tan 45° = 1]
Which one of the following is NOT the correct formula for refractive index of glass w.r.t. air (aμg) (i = angle of incidence, r = angle of refraction)
For total internal reflection to take place, the angle of inddence i and the refractive index µ of the medium must satisfy the inequality ____________.
The twinkling effect of star light is due to ______.
The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur.
What are the conditions to achieve total internal reflection?
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is ______.
A ray of light passes from vacuum into a medium of refractive index µ, the angle of incidence is found to be twice the angle of refraction. Then the angle of incidence is ______.
A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer ______.
State two differences between normal reflection and total internal reflection.
