TY  - BOOK
AU  - Edser,Edwin
ED  - Asutosh Collection (National Library, India)
TI  - Light for students
U1  - 535 
PY  - 1925///
CY  - London
PB  - Macmillan
KW  - Optics
N1  - "Answers to questions": p.[573]-574
ER  -