Question

If you own a pair of polarizing sunglasses, look at the LCD screen of your calculator while wearing the glasses. Explain what you see. You may also notice the rear windows of some automobiles show patterns when viewed with your sunglasses. Can you explain why?

Answer 1

“These LCD screens are polarized to reduce glare, especially in bright sunlight—but so are sunglasses,” “When the filters for the screen and sunglasses align in opposite directions, the light emanating from the screen with be cut out.” In other words, if the screen emits horizontally-vibrating light, and your sunglasses block all except vertically-vibrating light, no photons will get through and you’ll be stuck with a dark or entirely black image.

Turn the screen 90 degrees in either direction. This will align the polarizing filter on your screen with the one on your sunglasses, and the light from your screen will be able to pass through to your eyes.

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