Question

7. The grating element of a plane transmission grating of 15000 lines per
Inch is
a) 1.583 x 104 cm
b) 1.612 * 104 cm
c) 1.693 x 10 cm
)
d) 1.721 x 104 cm​

Answer 1

Answer:

a)1.583*104cm bhbbbbbbbbhbbbbb

Answer 2

Answer: 1.583 x 104 cm

Explanation:

A grating is an arrangement consisting of a large number of parallel slits of the same width and separated by equal opaque spaces.

• It is obtained by ruling equidistant parallel lines on a glass plate with the help of a diamond.
• The lines act as opaque spaces and the incident light cannot pass through them. The space between the two lines is transparent to light and acts as a slit.
• The spacing between the lines is of the order of the wavelength of visible light. The number of lines in a plane transmission grating is of the order of 15000 to, 20000 per inch.
• The width of each slit is a and opaque spacing between two consecutive slits is. b.
• (a+b) is called a grating element or grating constant.
• It can be seen that the distance between two consecutive slits is the grating element.

The grating element of a plane transmission grating of 15000 lines per inch is 1.583 x 104 cm.

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