question_answer 22)

  Which of the following phenomena of Light are involved in the formation of a rainbow? (a) Reflection, refraction and dispersion                                (b) Refraction, dispersion and total internal reflection (c) Refraction, dispersion and internal reflection               (d) Dispersion, scattering and total internal reflection

Answer:

                  (C) A rainbow is caused by dispersion, refraction and internal reflection of sunlight by tiny water droplets, present in the atmosphere and always formed in a direction opposite to that of the sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally and finally refract it again when it comes out of the raindrop.