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JEE Main 31 August 2021, Shift 1, Physics Q5

Question 5 of 90 in this shift, Physics question 5 of 30, Section A.

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

)

The figure, in words

Two mirrors drawn as hatched lines at right angles: M_1 vertical on the left, M_2 horizontal at the bottom. Point source P is marked at the top; the horizontal distance from M_1 to P is labelled a and the vertical distance from P down to M_2 is labelled 2a.

(1) $3a$
(2) $4.6a$ Official answer
(3) $2\sqrt{10}\,a$
(4) $2.3a$

Official answer

Option 2

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy