Question

define reaction of light, dispersion of light and phenomenon of rainbow, twinkling of stars, mirage.
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Answer 1

Answer:

Reaction of light : The reaction of something, especially the iris of the eye, to different intensities of light.

Dispersion of light : The splitting up of light into its constituent colours while passing from one medium to the other is called dispersion.

Phenomenon of rainbow : A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the Sun.

Twinkling of stars : The stars seem to twinkle in the night sky due to the effects of the Earth's atmosphere. When starlight enters the atmosphere, it is affected by winds in the atmosphere and areas with different temperatures and densities. This causes the light from the star to twinkle when seen from the ground.

Mirage : Mirage is an optical illusion caused due to total internal reflection of light. The light gets refracted when it passes from cold to hot air and so light bends. The refracted light reaches to a point where the light tends to form an angle of 90 degree.

~~~~ Rimika