First slide

Diffraction of light-Wave Optics

Question

Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32°. The second order diffraction will be seen at

Moderate

A

48°
B

64°
C

80°
D

There is no second order diffraction in this case

Solution

For a grating $(e + d) {sinθ}_{n} = nλ$
where $(e + d) =$ grating element
${sinθ}_{n} = \frac{nλ}{(e + d)}$
For $n = 1, {sinθ}_{1} = \frac{λ}{(e + d)} = \sin 32 °$
$This is more than 0.5 . Now sinθ will be more than 2 \times 0.5, which is not possible .$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App