An observer is watching the Stars to be twinkle on Earth. The cause is :(a) It is true that Stars do not emit light continuously(b) Frequency absorption of light of Stars by atmosphere of their own(c) Frequency absorption of light of Stars by atmosphere of Earth(d) Increase and decrease of the refractive index in atmosphere of Earth

An observer is watching the Stars to be twinkle on Earth. The cause is

1.	An observer is watching the Stars to be twinkle on Earth. The cause is :(a) It is true that Stars do not emit light continuously(b) Frequency absorption of light of Stars by atmosphere of their own(c) Frequency absorption of light of Stars by atmosphere of Earth(d) Increase and decrease of the refractive index in atmosphere of Earth
Answer» (d) Increase and decrease of the refractive index in atmosphere of Earth Twinkling of Stars is possible due to increase or decrease of refractive index in atmosphere of Earth.