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

a)

Violet light is refracted more hence it has larger index of refraction than red light.

b)

Violet light is refracted with larger angle thus is bent more.

c)

Light is collimated so that the light rays entering the prism will be parallel and thus dispersed lghts will get at different positions

Thus option A) is correct.

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