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For checking straightness, straight edge is placed over a surface and these two are viewed against the light. Which of the following option true if colour of light is red?

Correct Answer: gap between 0.0012 to 0.0017 mm

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Metrology and Measurements MCQ: For checking straightness, straight edge is placed over a surface and these two are viewed against the light. Which of the following option true if colour of light is red? | Extra Education