Advertisements
Advertisements
प्रश्न
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].
Advertisements
उत्तर
Given, critical angle, C = 42°
At a point Q, i = 48° and iC = 42°
i.e. i > iC
r = 48°
At a point P, i = 42° and iC = 42°
i = iC
Therefore, r = 90°
APPEARS IN
संबंधित प्रश्न
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.
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.
Choose the correct option.
Angles of deviation for extreme colours are given for different prisms. Select the one having maximum dispersive power of its material.
Answer the following question.
What are the advantages of optical fibre communication over electronic communication?
Total internal reflection can take place only if light is travelling from ______.
A particle is projected such that the horizontal range and vertical height are equal. Then the angle of projection is :
The outer concentric shell in optic fiber is called ______.
Which of the following statements about total internal reflection is true?
