The rear brake lights on a car emit white light but are covered with plastic that allows only pure red light to pass through. What color of plastic would the red light have to pass through in order to emerge as green light?

Question

Quizplus · Accepted Answer

The color of light is determined by its wavelength. Red and green light have different wavelengths, and a filter or plastic color can only remove certain wavelengths, not change them. Therefore, it's impossible for any color of plastic to transform pure red light into green light.

The Rear Brake Lights on a Car Emit White Light