English

How is the Critical Angle of a Material Related to Its Refractive Index? - Physics

Advertisements
Advertisements

Question

How is the critical angle of a material related to its refractive index?

Short/Brief Note
Advertisements

Solution

Relation of critical angle and refractive index:

μ = `1/sin "C"`

Where μ = refractive index of the material and C = critical angle.

shaalaa.com
  Is there an error in this question or solution?

RELATED QUESTIONS

Angle of deviation is the angle which the ______ ray makes with the direction of ______ray. 


A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.


What is total internal reflection? 


Write the necessary conditions for the phenomenon of total internal reflection to

occur ?


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?


Swarali has got the following observations while doing an experiment. Answer her questions with the help of observations.

Swarali observed that the light bent away from the normal, while travelling from dense medium to rarer medium. When Swarali increased the values of angle of incidence (i), the values of angle of refraction (r) went on increasing. But at a certain angle of incidence, the light rays returned into the dense medium.

So, Swarali has some questions. Answer them –
a) Name this certain value of ‘i ’. What is the value of ‘r’ at that time ?
b) Name this process of returning of light in dense medium. Explain the process.

 


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].


(a) A ray of monochromatic light enters glass PQRS as shown in the fig. Complete the path of ray till it emerges from the glass. (Critical angle of glass is 420). 

(b) Draw diagram of a prism periscope.
(c) What are the advantages of total internal reflecting prism over plane mirror?


State two advantages of using a right-angle prism as a reflector, rather than a plane mirror.


Observe the given figure and write appropriate phenomenon of light in the box.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×