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timama [110]
3 years ago
10

Calculate the angle for the third-order maximum of 580-nm wavelength yellow light falling on a diffraction grating with 500 line

s/mm.
Physics
1 answer:
kirill115 [55]3 years ago
6 0

Answer:

60.46°

Explanation:

Given that, the wavelength of yellow light which is falling on grating is,

\lambda=580 nm\\\lambda=580\times 10^{-9}m

The angle is of the order of 3 means m=3.

And number of lines per mm is,

N=500\frac{lines}{mm}\\N=(500\times 10^{3})\frac{lines}{m}

Therefore the condition of maxima,

m\lambda=dsin\theta

Here, d=\frac{1}{N}

And for third order maxima, m=3

3\lambda=\frac{1}{N} sin\theta\\sin\theta=3 \lambda N

Therefore,

sin\theta=3\times 580\times 10^{-9}m\times 500\times 10^{3}m\\sin\theta=0.87\\\theta=sin^{-1} (0.87)\\\theta=60.46^{\circ}

Therefore, the angle for third order maxima is 60.46°.

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