Verma, R. K. <br/><br/>
Ray optics 

 - New Delhi  Discovery Publishing House  2006 
 - 341p. 
<br/><br/><label>ISBN: </label> RS 850.00 
<br/><br/><label>Source: </label> RS 850.00 
<br/><br/><label>Dewey Class. No.: </label>535 VER