Question

A plane diffraction grating has 12500 rulings and a width of 2.5 cm. find the grating element
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Answer 1

Answer:

A diffraction grating is made by making many parallel scratches on the surface of a flat piece of some transparent material. It is possible to put some large number of scratches per cm on the material. For example, the grating to be used has 6,000 lines per cm on it. The scratches are opaque but the areas between the scratches can transmit the light through. Thus, a diffraction grating becomes a multitude for the source with parallel slit, when light falls upon it. In this topic, a student will learn the diffraction grating formula with examples. Let us learn the concept!

Diffraction Grating Formula

Answer 2

Answer:

The grating element of the plane diffraction grating is 2×10⁻⁴cm.

Explanation:

• Grating is the arrangement of parallel slits with equal width separated by same opaque space between them.

• Grating elements is the sum width of every slit (a) and the opaque spacing between two slits (b).

        Grating element = a + b

• Grating element is also the number of lines per cm. If N is the number of lines and w is width of slits.

         Grating element = w/N

We have given, The number of rulings = N= 12500

The width of each slit , w = 2.5 cm

Grating element $=\frac{2.5}{12500} =2*10^{-4}cm$

Therefore, the grating element  is equal to 2×10⁻⁴cm.