Which of the following statements with regard to the phenomenon of the primary rainbow formation by water droplets is/are correct ? 1. It involves refraction and one internal reflection of sunlight. 2. It involves refraction of sunlight only. 3. It is formed as the inner bow. 4. It may involve more than one internal reflection as well as refraction of sunlight. Select the answer using the code given below :

Which of the following statements for persons suffering from presbyopia is/are correct ? 1. They cannot distinguish colours. 2. It usually develops with ageing. 3. They wear either bi-focal lenses co…

The phenomenon of rainbow formation by water droplets involves :

Which one of the following statements is correct regarding the travel of a light beam from a rare to a dense medium?

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 ?

A glass prism splits white light into different colours. This phenomenon is called dispersion of light by prism. Which one of the following statements is correct ?