Question : A light wave is incident over a plane surface with velocity x. After reflection, the velocity becomes:
Option 1: x/2
Option 2: x
Option 3: 2x
Option 4: x/4
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Correct Answer: x
Solution : The correct option is x.
When a light wave is incident on a plane surface, its velocity remains unchanged after reflection. The speed of light is determined by the properties of the medium it is travelling through. In a uniform medium, like air, the velocity of light remains constant, unaffected by reflection off a surface.
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Question : In a filament-type light bulb, most of the electric power consumed appears as
Option 1: visible light
Option 2: infrared rays
Option 3: ultraviolet rays
Option 4: fluorescent light
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
Question : Dioptre is the unit of:
Option 1: power of a lens
Option 2: focal length of a lens
Option 3: light intensity
Option 4: sound intensity
Question : Which of these waves can be polarised?
Option 1: Sound waves in the air
Option 2: Longitudinal waves on a string
Option 3: Transverse waves on a string
Option 4: Light waves
Question : Sir C.V. Raman was awarded the Nobel Prize for his work on:
Option 1: Light scattering
Option 2: Radioactivity
Option 3: Cryogenics
Option 4: Sonometer
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