NCERT Exemplar III — task. Science CBSE, Class 10.

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1. Which of the following phenomena of light are involved in the formation of a rainbow?

Reflection, refraction and dispersion
Refraction, dispersion and total internal reflection
Dispersion, scattering and total internal reflection
Refraction, dispersion and internal reflection

2. Twinkling of stars is due to atmospheric

scattering of light by dust particles
dispersion of light by water droplets
internal reflection of light by clouds
refraction of light by different layers of varying refractive indices

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