(a) Mention the reasons for the following phenomena:
(i) Dispersion of light
(ii) Twinkling of stars
(iii) Tyndall effect
(iv) Blue colour of the sky.
(b) How would the sky appear in the absence of earth's atmosphere?
(a) (i) Difference in speed in medium for different wavelengths/colours of light.
(ii) Atmospheric refraction
(iii) Scattering of light by colloidal particles
(iv) Atmospheric scattering.
(b) In the absence of earth's atmosphere, there will not be any scattering of light, and so the sky will appear dark.
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