Simple Spherical Double Convex lenses having two out side curved parallel surfaces to each other and used for magnification and converging the light and having a positive focal length. Similarly Spherical Double Concave lenses having a negative focal length and two inwards parallel surfaces and diverging the light. Manufactured the lenses from tint plate glass, are highly polished and well edged.
Ready stock sizes are available as under :
| Diameter | Focal Length | |
| ( a ) | 38 mm | 5 cm |
| 38 mm | 10 cm | |
| ( b ) | 50 mm | 5 cm |
| 50 mm | 10 cm | |
| 50 mm | 15 & 20 cm | |
| 50 mm | 30 , 50 & 100 cm | |
| ( c ) | 60 mm | 15 cm |
| 60 mm | 20 cm | |
| ( d ) | 75 mm | 15 cm |
| 75 mm | 20 cm | |
| ( e ) | 100 mm | 20 cm |
For prices download our catalogue bottom left & price list from the link above.