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University of Wisconsin - Milwaukee

# A beam of 541-nm light is incident on a diffraction grating that has 400 grooves/mm. (a) Determine the angle of the second-order ray. (b) What If? If the entire apparatus is immersed in water, what is the new second-order angle of diffraction? (c) Show that the two diffracted rays of parts (a) and (b) are related through the law of refraction.

## a. $25.6^{\circ}$b $18.99^{\circ}$c. $\frac{\sin \theta_{a}}{\sin \theta_{b}}=n$

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##### Christina K.

Rutgers, The State University of New Jersey

LB