Rainbow is produced when sunlight falls on drops of rain. which of the following physical phenomena are responsible for this?

Which one of the following phenomenon is used in optical fibres?

The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is

Which one of the following colours is seen in the middle of a Rainbow?

When a light beam falls on a triangular glass prism, a band of colours is obtained. Which one of the following statements is correct in this regard ?

The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon –