Telangana Board Solutions for Chapter: Refraction of Light at Curved Surfaces, Exercise 1: Exercise 1

Find the focus by drawing a ray diagram using the position of source S and the image S' given in the figure.

A parallel beam of rays is incident on a convergent lens with a focal length of $40 \mathrm{cm}$. Where a divergent lens with a focal length of $15 \mathrm{cm}$ should be placed for the beam of rays to remain parallel after passing through the two lenses? Draw a ray diagram.

The distance between two point sources of light is $24 \mathrm{cm}$ .Where should a convergent lens with a focal length of $f=9 \mathrm{cm}$ be placed between them to obtain the images of both sources at the same point?

Suppose you are inside the water in a swimming pool near an edge. A friend is standing on the edge. Do you find your friend taller or shorter than his usual height? Why?

Which one of the following materials cannot be used to make a lens?

Which of the following is true?

The value of the focal length of the lens is equal to the value of the image distance when the rays are

Which of the following is the Lens maker’s formula?