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Find region on Y axis in which reflected rays are present object is at A(2,0) and MN is a plane mirror as shown:

 

$(a)\;(0,2) to (0,6) \\ (b)\;(0,4) to (0,7) \\ (c)\;(0,9) to (0,8) \\ (d)\;(0,6) to (0,8) $

1 Answer

The image of point A in the mirror is at A' (6,0).
Join a'M and extend to cut Y-axis at M'
(Ray originating from A which strikes the mirror at M gets reflected as the ray MM' which appears to come from A'
Join A'N and extend to cut Y-axis at N' (Ray originating from A which strikes the mirror at N gets reflected as the ray NN' which appears to come from A')
From geometry $M'=(0,6)$
$N'= (0,9)$
$M'N'$ is the region on Y-axis in which reflected rays are present.
Hence d is the correct answer
answered Feb 10, 2014 by meena.p
 

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