I am stuck on the following problem :
An object is placed in front of a plane mirror of length $L$ at a distance $d$ of its bisector line .An observer is at a perpendicular distance of $2d$ from the mirror.If the observer is walking parallel to the mirror ,upto what maximum possible distance he can observe the image of that object . The options are
(a) $2L\,$ (b) $\,3L\,$ (c)$\,4L\,$(d)$\,5L\,$
Can someone please explain ?
Here are diagrams of what's going on:
You can work out how long the line at the bottom is by comparing the big triangle with the little triangle. They are similar triangles.