defence exam Navy SSR (Medical) Mock Test Series 2025 Physics Optics Diffraction

A grating has 15 cm of the surface ruled with 6000 lines per cm . What is the Dispersive power of grating at the angle of θ = 60° in the first order?

1

8000 rad/m

2

20000 rad/m

3

8000 rad/cm

4

2000 rad/cm

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