A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?

A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in Figure 11.1. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

At noon the sun appears white as

Which of the following phenomena of light are involved in the formation of a rainbow?