Question : For a ray of light to suffer total internal reflection it has to pass from:
Option 1: glass to water
Option 2: water to glass
Option 3: air to water
Option 4: air to glass
Correct Answer: glass to water
Solution : The correct option is glass to water.
The angle of incidence of a light beam passing from a denser medium to a less dense medium must be larger than the critical angle for total internal reflection to take place. The incidence angle past which there is complete internal reflection is known as the critical angle. It depends on the refractive indices of the two media involved. So if light travels from glass (denser medium) to water (less dense medium) and the angle of incidence is greater than the critical angle for that combination of media, total internal reflection will occur.
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Question : The redness in the atmosphere at Sunrise and Sunset is due to:
Option 1: Refraction of light
Option 2: Reflection of light
Option 3: Dispersion of light
Option 4: Scattering of light
Question : What are the primary types of environmental pollution?
Option 1: Air, Water, and Noise
Option 2: Air, Soil, and Light
Option 3: Water, Soil, and Thermal
Option 4: Air, Water, Soil, Noise, Light, and Thermal
Question : Which of these travels in glass with minimum velocity?
Option 1: Red light
Option 2: Violet light
Option 3: Green light
Option 4: Yellow light
Question : The _______ of a ray is the angle measured from the reflected ray to the normal surface.
Option 1: Angle of Diffusion
Option 2: Angle of Reflection
Option 3: Angle of Incidence
Option 4: Angle of Refraction
Question : A star appears twinkling in the sky because of :
Option 1: scattering of light by atmosphere
Option 2: reflection of light by atmosphere
Option 3: refraction of light by atmosphere
Option 4: diffraction of light by atmosphere
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