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Which colour of light is filtered by filter present in Zeiss Ultra-optimeter?

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Which colour of light is filtered by filter present in Zeiss Ultra-optimeter?

(a) Red

(b) Blue

(c) Green

(d) Yellow

The question was posed to me at a job interview.

My enquiry is from Uses of Comparators topic in portion Comparators of Engineering Metrology

1 Answer

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Best answer
Correct choice is (c) Green

Explanation: Zeiss ultra-optimeter gives a high degree of magnification. This instrument has an optical system involves a double reflection of light. A green filter is present which filters all but the green light which is less fatiguing to the eye.

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