A filter appears red under white light. What wavelengths of light does this filter primarily allow to pass through?
Understand the Problem
The question is asking which wavelengths of light a red filter allows to pass through. Filters work by absorbing certain wavelengths of light and transmitting others. A filter appears a certain color because it transmits that color of light.
Answer
A red filter allows primarily red wavelengths of light to pass through.
A red filter primarily allows red wavelengths of light to pass through it while absorbing other colors. This is why it appears red under white light.
Answer for screen readers
A red filter primarily allows red wavelengths of light to pass through it while absorbing other colors. This is why it appears red under white light.
More Information
White light is composed of all the colors of the visible spectrum. A colored filter works by selectively absorbing certain wavelengths (colors) of light and transmitting others. A red filter appears red because it transmits red light while absorbing most other colors.
Tips
A common mistake is thinking that the filter emits red light, but it actually transmits the red wavelengths that are already present in the white light source.
Sources
- What color of light does a red filter allow to pass through it? - Answers - answers.com
- Everything looks red through a red filter because. a) The filter emits ... - homework.study.com
- Colour and Colour Filters - GCSE Physics - YouTube - youtube.com
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