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- Homework Statement
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- Relevant Equations
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Suppose a square lattice. The planes are such as the image below:

I light wave incides perpendicular to the square lattice.

The first maximum occurs for bragg angle (angle with the plane (griding angle) as ##\theta_B = 30°## (blue/green), green/blue in the figure).

The angle that the interplanes of the crystal make with the horizontal is ##\alpha## (yellow).

What is the de Broglie wave?

To be honest, i am so confused with this question that i have no idea what to say.

The first immediate confusion is how an ray coming perpendicularly to the crystal makes an angle ##30°##, so that the complementar of it be ##60°##, if obviously the angle (yellow) makes is ##atan(d/2d) \neq 60°##

I light wave incides perpendicular to the square lattice.

The first maximum occurs for bragg angle (angle with the plane (griding angle) as ##\theta_B = 30°## (blue/green), green/blue in the figure).

The angle that the interplanes of the crystal make with the horizontal is ##\alpha## (yellow).

What is the de Broglie wave?

To be honest, i am so confused with this question that i have no idea what to say.

The first immediate confusion is how an ray coming perpendicularly to the crystal makes an angle ##30°##, so that the complementar of it be ##60°##, if obviously the angle (yellow) makes is ##atan(d/2d) \neq 60°##

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