defence exam BSF Head Constable (RO/RM) Mock Test 2023 Physics Wave Optics Diffraction

A diffraction grating has 1.26 × 104 rulings uniformly spaced over a width w = 25.4 mm. At what angle does the first order maximum occur when light of wavelength 589 nm is incident on it?

1

33.98°

2

16.98°

3

15.8°

4

8.49°

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