Concave Lens Double is an SSI India product in the OPTICS category. Key specifications include SKU: SSI.PHY.OPT.002. Diameter: 38mm Focal Length: 100mm Power: -10.00D ii. Diameter: 38mm Focal Length: 1000mm Power: -1.00D iii. Diameter: 38mm Focal Length: 50mm Power: -20.00D iv. Diameter: 38mm Focal Length: 150mm Power: -6.67D v. Diameter:
