Advertisements
Advertisements
Question
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?
Solution
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
RELATED QUESTIONS
Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect
Draw diagram to illustrate the total internal reflection.
Plot a graph between
Angle of incidence versus angle of reflection,
Plot a graph between
Sine of angle of incidence versus sine of angle of refraction,
What is meant by the term ‘critical angle’?
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.
Which of the following is not involved in formation of a rainbow?
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
The phenomena involved in the reflection of radiowaves by ionosphere is similar to ______.
