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If a is the width of the slits and b the distance between the slits, then a + b is called as _________

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If a is the width of the slits and b the distance between the slits, then a + b is called as _________

(a) Opacities

(b) Transparency

(c) Grating Constant

(d) Grating value

I got this question in exam.

My question is from Plane Diffraction Grating topic in portion Diffraction of Engineering Physics II

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Right choice is (c) Grating Constant

To explain I would say: The sum of the width of the slits and the distance between the slits is called the grating constant of the grating. It can also be described as the separation between the corresponding point of two adjacent transparencies.

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