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A new plastic lens material "SR-47" is being proposed for release onto the market. The specification of the lens (in com
Posted: Tue Jul 05, 2022 7:28 am
by answerhappygod
- A New Plastic Lens Material Sr 47 Is Being Proposed For Release Onto The Market The Specification Of The Lens In Com 1 (62.65 KiB) Viewed 13 times
A new plastic lens material "SR-47" is being proposed for release onto the market. The specification of the lens (in comparison to existing materials, Crown Glass, CR-39 and Polycarbonate) is shown below: Refractive Index Abbe Specific Gravity Transmittance Impact Resistance Crown Glass 1.52 60 * 2.54g/cm3 99% Low CR-39 1.49 58 1.31g/cm3 99% Moderate Polycarbonate 1.59 32 1.20g/cm3 99% High SR-47 1.67 32 2.69g/cms 147% High You are to design an anti-reflective coating for SR-47. Assuming a wavelength of 570nm is used as the reference wavelength, the coating should have the following characteristics. Refractive index: ANSWER 2-2 (to TWO decimal places, 1 mark) Thickness: ANSWER 2-3 nm (1 mark)