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प्रश्न
Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.
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उत्तर
The factors which affect the critical angle are:
- Wavelength (colour) of light: Since a transparent medium's refractive index increases with violet light and decreases with red light, the critical angle for a pair of media increases with red light and decreases with violet light. Thus, the critical angle rises as the light's wavelength increases.
- The temperature: The critical angle for that pair of media increases as the temperature of the medium rises because its refractive index falls. As a result, the critical angle rises as the temperature rises.
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संबंधित प्रश्न
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
Define critical angle for a given medium.
How are critical angles related to the refractive index of the medium?
What is meant by the term ‘critical angle’?
A ray of light is incident as a normal ray on the surface of separation of two different mediums. What is the value of the angle of incidence in this case?
Explain ‘mirage’ as an illustration of refraction.
For the same angle of incidence, the angle of refraction in four media A, B, C and D are 25°, 30°, 35° and 40° respectively. The speed of light is least in medium ______.
A green light is incident from the water to the air-water interface at the critical angle (θ). Select the correct statement.
Name any two phenomena which take place in the formation of a rainbow.
