A diffraction grating is essentially many Young's double slits side by side. If the number of slits is changed from 2 to 50 but the distance between each slit remains the same, how does the interference pattern change?
A. The number of bright fringes increases.
B. The number of bright fringes decreases.
C. The bright fringes get wider and brighter.
D. The bright fringes get narrower and brighter.
Answer: D. The bright fringes get narrower and brighter.
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