TY  - BOOK
AU  -  Minhaj-ud -Din
TI  - A Text Book Of Light
U1  - PL132 
PY  - 1946///
CY  - Lahor
PB  - Qaumi Kutub Khana 
N1  - Pl mean Physics Light, Heat and Sound Page 465-469 in A-Z Register (Acc. No. Pl1-Pl133)
ER  -