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Refraction of light by the earth’s atmosphere due to variation in air density is called

• atmospheric reflection

• atmospheric dispersion

• atmospheric scattering

• atmospheric refraction

The colored light that refracts most while passing through a prism is

• Red

• Yellow

• Blue

• Violet

Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

• Rainbow

• Twinkling of stars

• Advanced sunrise and delayed sunset

• Stars seem higher than they actually are

One cannot see through the fog, because

• refractive index of the fog is very high

• fog absorbs light

• light is scattered by the droplets

• light suffers total reflection at droplets

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

• is scattered the most by smoke or fog

• is absorbed the most by smoke or fog

• is scattered the least by smoke or fog

• moves fastest in air

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

• Dispersion of light

• Scattering of light

• Total internal reflection of light

• Reflection of light from the earth

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When a white light falls on a triangular prism, the colour of light which will deviate the least is

• violet

• green

• blue

• red

Formation of rainbow is due to..........

• refraction of light

• scattering of light

• dispersion of light

• atmospherics refraction

Atmospherics refraction explains the natural phenomena

• twinkling of stars

• Sky appears blue

• Refraction of light through a prism

• rainbow formation

Assertion: Planets do not twinkle

Reason: Light rays do not come from planet

• Assertion and reason are true. Reason is the correct explanation of Assertion

• Assertion and reason are false

• Assertion is false, but reason is true

• Assertion is true, but reason is false