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Monochromatic high energy x-rays are incident on a crystal. If 1st order reflection is observed at an angle 3.4°, at what angle would 2nd order reflection be expected.
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Given,

For first order reflection, 

Ø1=3.4°

To find, 

Ø2=??

Sice it is the same monochromatic x-ray, values of d(interstitial distance) and L(here lambda)

Using Bragg's Law,  2dsinϕ=nL

For first order reflection,

2dsin(3.4)=(1)L......(1)

For second order reflection,

2dsinØ2=(2)L .......(2)

Dividing (1) and (2),

=>  sin3.4sinØ2=12

=>  sinØ2=2×sin3.4

=> Ø2 = 6.25°

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