A polarized tester, when used properly, helps determine if sunglasses or lenses are actually polarized. Here's how:
The video reference shows that when you put the polarized lens over the polarized tester, and rotate the lens, you should see a change in color or darkness. If there is no change, the lens is likely not polarized.
Steps to Use a Polarized Tester:
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Obtain a Polarized Tester: These testers are often available where polarized sunglasses are sold. They usually feature a polarized light source or image.
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Place the Sunglasses/Lens Over the Tester: Position the sunglasses lens or the loose lens directly in front of the polarized tester's viewing area.
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Rotate the Lens: Slowly rotate the sunglasses or the lens while observing the tester through it.
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Observe for Changes:
- Polarized Lenses: If the lenses are polarized, you will see a noticeable change in the image or brightness of the tester as you rotate the lens. Typically, the image will appear darker or even completely black at a certain angle. Colors may also shift.
- Non-Polarized Lenses: If the lenses are not polarized, there will be little to no change in the image or brightness as you rotate the lens.
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Interpretation: The presence of a significant change (darkening, color shift) during rotation indicates that the lenses are polarized. Lack of change indicates they are not.
In summary, using a polarized tester involves observing how a lens affects polarized light as it's rotated. A genuine polarized lens will significantly alter the light transmission.
