Have you seen your face on mirror

Geometry Level 3

A mirror of length 2X is kept in front of a road as shown in fig. A point object is kept at a distance X from the mirror. An observer is able to see the image till distance 12X while moving along the road. Then distance Y between the road and the mirror in terms of X is nX Find n


The answer is 5.

Manish Mayank by Manish Mayank , 20, India

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

2 solutions

Uahbid Dey
Jun 17, 2014

apply similar triangle law. => 12x/2x = (x+nx)/x => 6 = 1+n => n = 5

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Try Solving for this, Area of trapezoid = area of triangle 1 - area of triangle 2. You will get the equation as, 7nx^2 = x^2(6n+5) => 5

0 Helpful 0 Interesting 0 Brilliant 0 Confused

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...