TY  - BOOK
AU  - Noakes , G . R
TI  - A Text Book Of Light
U1  - PL114 
PY  - 1940///
CY  - London
PB  - Macmillan And Co
KW  - Physics Light, Heat and Sound
N1  - PL means Physics Light, Heat and Sound Page No. 465-469 in A-Z Accession Register (Accession No. PL1-PL131)
ER  -