Anita Paul, Seema Sinha, Karuni Subrahmanyam and, Deepika Parashari Solutions for Exercise 1: Put on your THINKING CAP!

The process of bouncing back of light in the same medium in which it was travelling earlier after striking a surface is called _____.

(Choose from: reflection/dispersion)

Polished metal surfaces are known as _____ (mirror/ irregular) reflectors.

A _____ (convex/ concave) lens can form both real as well as virtual images.

A _____ image can be obtained on a screen.

Avni stands $7 \mathrm{m}$ in front of a plane mirror with a painting on a wall $2 \mathrm{m}$ behind her. Calculate the distance between:
ii) Avni’s image and the image of the painting.

Avni stands $7 \mathrm{m}$ in front of a plane mirror with a painting on a wall $2 \mathrm{m}$ behind her. Calculate the distance between:
iii) Avni and her image.

Avni stands $7 \mathrm{m}$ in front of a plane mirror with a painting on a wall $2 \mathrm{m}$ behind her. Calculate the distance between:
iv) Avni’s image and the painting if Avni moves $2 \mathrm{m}$ towards the mirror.

List two uses each of concave and convex lenses.