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प्रश्न
What do you understand by the deviation produced by a prism? Why is it caused?
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उत्तर
Prism-produced Deviation is the bending of a light beam away from its intended path. Ray AB would have followed the path if there had been no prism. ABDF, but the prism has forced the light ray to bend twice in the direction of the prism's base, and the emerging beam EK seems to be coming from DEK.
Cause: When light travels from one medium to another, in this example, from air to a glass prism, its speed changes. This change in speed causes the light to deflect and enter the new medium glass at a different angle.
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संबंधित प्रश्न
In the given figure PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS.
- State the special name given to the angle of incidence ∠PQN of the ray PQ.
- What is the angle of refraction for the refracted ray QS?
- Name the phenomenon that occurs if the angle of incidence ∠PQN is increased.
- The ray PR suffers partial reflection and refraction on the water-air surface. Give reason.
- 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.
One day Chetan’s mother developed a severe stomach ache all of a sudden. She was rushed to the doctor who suggested for an immediate endoscopy test and gave an estimate of expenditure for the same. Chetan immediately contacted his class teacher and shared the information with her. The class teacher arranged for the money and rushed to the hospital. On realizing that Chetan belonged to a below average income group family, even the doctor offered concession for the test fee. The test was conducted successfully.
Answer the following questions based on the above information:
(a) Which principle in optics is made use of in endoscopy?
(b) Briefly explain the values reflected in the action taken by the teacher.
(c) In what way do you appreciate the response of the doctor on the given situation?
Calculate the speed of light in a medium whose critical angle is 30° ?
Plot a graph between
Sine of angle of incidence versus sine of angle of refraction,
Make the correct choices for each of the following :
Total Internal reflection takes place when
(where ∠i = angle of incidence, ∠r = angle of refraction, ∠C = critical angle)
State one factor on which a critical angle for a given pair of media depends. The critical angle for the glass-air interface is 45° for the yellow light. Will it be equal to, less than or greater than 45° for (i) red light, (ii) blue light?
Answer the following question.
Define the critical angle of incidence and obtain an expression for it.
The outer concentric shell in optic fiber is called ______.
Name any two phenomena which take place in the formation of a rainbow.
