The luminous border that surrounds the profile of a mountain just before sun rises behind it, is an example of

In biprism experiment, the distance between source and eyepiece is 1.2 m, the distance between two virtual sources is 0.84 mm. Then the wavelength of light used if eyepiece is to be moved transversely through a distance of 2.799 cm to shift 30 fringes is

If a star emitting yellow light is accelerated towards earth, then to an observer on earth it will appear