logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Browse Questions
Ad
0 votes

Two plane mirrors are inclined to each other at some angle. A ray of light incident at $30^{\circ}$ on one mirror after reflection from the other mirror retracts its path. The angle between the mirror is :

$(a)\;30^{\circ} \\ (b)\;45^{\circ} \\ (c)\;90^{\circ} \\ (d)\;20^{\circ} $

Can you answer this question?
 
 

1 Answer

0 votes
Angle of incidence = angle of reflection $=30^{\circ}$
Since ray $ED$ returns its path it must fall normally
$\therefore \angle EDB= 90^{\circ}$
$\therefore \angle EOD= 90^{\circ}-60^{\circ}$
$\qquad= 30^{\circ}$
Hence a is the correct answer.
answered Jan 15, 2014 by meena.p
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...