TY  - BOOK
AU  - Perera,V.P.S.
TI  - Geometrical and Physical Optics
T2  - Faculty of Natural Sciences-  PYU 2261
U1  - 530 PER 
PY  - 2010///
CY  - Colombo
PB  - Open University
KW  -  chemistry
KW  - OUSL
N1  - Bachelor Science :Level 4
ER  -