Question 121: Ray Optics

Question

Two plane mirrors M
1
and M
2
are at right angle to each other shown. A point source 'P' is placed at 'a' and '2a' meter away from M
1
and M
2
respectively. The shortest distance between the images thus formed is : (Take $$\sqrt 5 $$ = 2.3)

Accepted Answer

Shortest distance is 2a between I
1
& I
3
But answer given is for I
1
& I
2
= $$\sqrt {{{(4a)}^2} + {{(2a)}^2}} $$
= $$a\sqrt {20} $$
= 4.47 a
Option (b)

Answer

3a

Answer

4.6a

Answer

2.3a

Answer

2$$\sqrt {10} $$a

Ray Optics

Two plane mirrors M 1 and M 2 are at right angle to each other shown. A point source 'P' is placed at 'a' and '2a' meter away from M 1 and M 2 respectively. The shortest distance between the images thus formed is : (Take $\sqrt 5 $ = 2.3)

Choose the correct answer: