Sorry about that. Specifically, the I measured the vertical FOV to be 64 deg, consistent with the documentation. However, I measured to the horizontal FOV to be 68 deg, which is different than the 80 deg specified. I haven’t changed any settings or messed with any parameters – this is basically just out of the box. Just wondering if anyone has seen this before. Thank you.

Fov of cameracalculator

A diffraction grating defines an optical component with a periodic structure that splits the light into various beams that travel in different directions. It is an alternative way to observe spectra other than a prism. Generally, when light is incident on the grating, the split light will have maxima at an angle θ.  The formula for diffraction grating is used to calculate the angle.

I measured the vertical FOV to be 64 deg, consistent with the documentation. However, I measured to the horizontal FOV to be 68 deg, which is different than the 80 deg specified.

Fov of cameraformula

If the vertical value is correct then it’s unlikely to be an issue with how you’re measuring, but a 15% difference from the specified horizontal value is quite significant.

As I understand it those are the values provided by our supplier. Any manufactured product will have some tolerance around its specifications, but you haven’t said how significant the differences are between what you measured and the expected values, so it’s hard to comment meaningfully. Also, the context of how you’re testing this, and why, are relevant here.

Question 1: A diffraction grating is of width 5 cm and produces a deviation of  300 in the second-order with the light of wavelength 580 nm. Find the slit spacing.

The Vertical FOV is given as 64 deg, Horizontal as 80 deg. However, from some tests, it appears that the FOV is smaller than these values, though my test setup may be flawed.