Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
The value of the critical angle for a given pair of media depends on the colour of light.
(Hint: Remember VIBGYOUR Violet has minimum ic whereas Red has maximum).
(i) For red light, the critical angle will be greater than 45°.
(ii) For blue light, the critical angle will be less than 45 °.
APPEARS IN
संबंधित प्रश्न
Prove the statement.
A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light.
Solve the previous problem if the paperweight is inverted at its place so that the spherical surface touches the paper.
Why do diamonds sparkle?
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.
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°).
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
Answer the following question.
Define the critical angle of incidence and obtain an expression for it.
Write any two uses of total internal reflection.
