A Metallic Sheet Has a Large Number of Parallel Slits $5.0 \mathrm {~mm}$

A metallic sheet has a large number of parallel slits, $5.0 \mathrm {~mm}$ wide and $20 \mathrm {~cm}$ apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is $6.0 \mathrm {~cm}$ , what is the largest angle from the normal, at which an intensity maximum occurs?

A) $84 ^ { \circ }$
B) $64 ^ { \circ }$
C) $69 ^ { \circ }$
D) $79 ^ { \circ }$
E) $74 ^ { \circ }$

Correct Answer:

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