Science- Physics- Human Eye and Colourful World

In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

The focal length of the eye lens increases when eye muscles

When light rays enter the eye, most of the refraction occurs at the

The bluish colour of water in deep sea is due to

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

The clear sky appears blue because

Twinkling of stars is due to atmospheric

At noon the sun appears white as

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. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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