The eyes of the nocturnal birds like owl are having a large cornea and a large pupil. How does it help them?

Explain the rules for obtaining images formed by a convex lens with the help of ray diagram.

Explain the construction and working of a 'Compound Microscope'.

A beam of light passing through a diverging lens of focal length 0.3m appear to be focused at a distance 0.2m behind the lens. Find the position of the object.

For a person with hypermetropia, the near point has moved to 1.5m. Calculate the focal length of the correction lens in order to make his eyes normal.