Question

A certain color emerges at 15° in the first-order spectrum. At what angle would this same color emerge in the second order if the same source and grating are used?

Answer 1

We use the following formula in finding the angle$n=d\sin\theta$

However, since same color emerge in the second order if the same source and grating are used the angle will remain the same.

Thus the angle= $15\degree$