TY  - GEN
AU  - Gupta, A B
TI  - Modern optics 
SN  - 9789384294649
U1  - 535 
PY  - 2015///
CY  - Kolkata
PB  - Books and Allied Pvt. Ltd., 
KW  - Fermat's principle
KW  - Spherical surface
KW  - Lens combination
KW  - Optical instruments
N1  - It Includes bibliographies and index
Appendix : 1-10
Index: i-vii
ER  -