Exercises

A person $1 \mathrm{m}$ in front of a plane mirror seems to be _____ $(1\mathrm{m} \mathrm{or} 2 \mathrm{m})$ away from his image.

Fill in the blank with the correct option given in the bracket.

Night birds have _____ cones than rods in their eyes. (more/fewer)

Explain how you can take care of your eyes.

What is the angle of incidence of a ray if the reflected ray is at an angle of ${90}^{\circ }$ to the incident ray?

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by $40 \mathrm{cm}$?

Two mirrors meet at right angles. A ray of light is incident on one at an angle of $30°$ as shown in the figure. Draw the reflected ray from the second mirror.        
      

Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see himself in the mirror? Also, can he see the image of objects situated at $\mathrm{P}, \mathrm{Q}$ and $\mathrm{R}$?
  

(a) Find out the position of the image of an object situated at $\mathrm{A}$ in the plane mirror (shown in figure below).
(b) Can Paheli at $\mathrm{B}$ see this image?
(c) Can Boojho at $\mathrm{C}$ see this image?
(d) When Paheli moves from $\mathrm{B} \mathrm{to} \mathrm{C}$, where does the image of $\mathrm{A}$ move?