A point source of light, S is placed at distance L in front of the… | JEE Main 2019 (12 Jan, Shift 1)

Q43JEE Main 2019 · 12 JAN · SHIFT 1Difficult

Reflection & Mirrors

A point source of light, S is placed at distance L in front of the centre of plane mirror of width d which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is

Show answer and solution

Answer: (c)

The image $S'$ is a distance $L$ behind the mirror. Reflected rays seem to come from $S'$ and pass through the mirror's edges.
The man's line is $L + 2L = 3L$ from $S'$ , while the mirror is $L$ from $S'$ .
By similar triangles the visible stretch $= d \times \frac{3L}{L} = 3d$
So the answer is (c) $3d$ .

Report a mistake

More questions on Reflection & Mirrors

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm…NEET 2018
A particle is oscillating on the X -axis with an amplitude 2 cm about the point x₀ = 10…JEE Main 2018 (15 Apr, Shift 1)
A beam of light from a source L is incident normally on a plane mirror fixed at a certain…NEET 2017
Match the corresponding entries of column 1 with column 2. [Where m is the magnification…NEET 2016 (Phase 1)
You are asked to design a shaving mirror assuming that a person keeps it 10 cm from his…JEE Main 2015 (10 Apr, Shift 1)
Two plane mirrors are inclined at 70°. A ray incident on one mirror at angle, θ after…NEET 2013
A rod of length 10 cm lies along the principal axis of a concave mirror of focal length…NEET 2012 (AIPMT, Mains)
A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m…JEE Main 2011 (AIEEE)

Reflection & Mirrors question from JEE Main 2019 (12 Jan, Shift 1)

More questions on Reflection & Mirrors