Jayasinghe, E.M <br/><br/>
Physics  geometrical optics 

 - Nugegoda  Open University  1986 
 - [4],117p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PHYSICS
<br/><br/><label>Dewey Class. No.: </label>535.32  / PHY