Which statement about optical filters is untrue? A. A low-pass filter can elimin

Question

Which statement about optical filters is untrue? A. A low-pass filter can eliminate 60-Hz noise in a microwave experiment. B. Filter manufacturers sell interference filters (also called bandpass filters) that only transmit light within a narrow range of frequencies. For example, an interference filter exists for use with a HeNe laser that strongly attenuates light at frequencies other than the red laser frequency f-4.75 x 1014 Hz. If you looked through one of these filters at a desklamp, the desklamp would look red. C. Filters are often employed to eliminate unwanted signals caused by background light. D. A notch filter can be used to block laser light. E. Use of a filter often improves the signal-to-noise ratio of a detection system.

Explanation / Answer

Optical filters are devices that selectively transmit light of different wavelengths, usually implemented as plane glass or plastic devices in the optical path .

the answer is

A) a low pass filler can eliminate 60 Hz noise in a microwave experiment.

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