Question

Two plane mirrors M₁ and M₂ are at right angle to each other shown. A point source 'P' is placed at 'a' and '2a' meter away from M₁ and M₂ respectively. The shortest distance between the images thus formed is : (Take √5 = 2.3)

(1) 3a

(2) 4.6 a

(3) 2.3 a

(4) 2√10 a

Answer 1

Correct answer is 2.

Shortest distance is 2a between I₁ & I₃

But answer given is for I₁ & I₂