2. NCERT Exemplar - Twinkling of stars

 

 

NoYes.

 

The light form the star undergoes continuous refractioncontinuous reflectioncontinuous diffractioncontinuous dispersion on entering the earth’s atmosphere. It occurs in a medium of change in optical densitysame refractive indexgradually changing refractive indexalter refractive index. As the density of air decreaseincreaseschangediminish gradually from top to bottom of the atmosphere, the refractive index also diminish decreasechangeincreases.

The apparent position of the star is the real positionis not the real positionslightly different from its actual positionsame as its actual position because the light form the star is curvebendzigzagstraight towards the normal as it travels through the atmosphere. The star appears same asparallelslightly lower thanslightly higher than its actual position.