Advertisements
Advertisements
Question
Write down the relationship between the critical angle and the refractive index of the medium.
Advertisements
Solution
Sin ic = `1/μ`
Where ic is the critical angle and μ is the refractive index of the medium.
RELATED QUESTIONS
Which colour of light has a higher critical angle? Red light or green light.
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
How is the angle of emergence ‘e’ related to the angle of incidence ‘i’?
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.
Critical angle of light passing from glass to air is maximum for ____________.
What is a mirage? How does it occur?
What are the examples of total internal reflection in nature?
- Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface.
- Reason (R): Refractive index of the material of the cladding of the optical fibre is greater than that of the core.
