TY  - BOOK
AU  - Subramanyam, N  .
AU  - Avadhanulu,M.N  .
AU  - Brijlal,.
TI  - Text book of optics / 
SN  - 81-219-2611-4
U1  - 535 
PY  - 2006///
CY  - New Delhi : 
PB  - S.Chand and Co , 
ER  -