1) You shine both red and blue light through a double slit. What can you say abo

Question

1) You shine both red and blue light through a double slit. What can you say about their interference patterns?

A) The blue bright fringes will be closer together than will be the red bright fringes.
B) The red bright fringes will be closer together than will be the blue bright fringes.
C) The red and blue bright fringes will be the same distance apart from each other.

2) You compare a double-slit interference pattern with the interference pattern due to a diffraction grating of the same spacing as that of the double-slit. The most noticeable difference would be that:

A) The peaks of the diffraction grating are much broader than that for the double-slit
B) The center point is a minimum, not a maximum
C) The center point is a maximum, not a minimum
D) The peaks of the diffraction grating are much closer together than for the double-slit
E) The peaks of the diffraction grating are much farther apart than for the double-slit
F) The peaks of the diffraction grating are much sharper than that for the double-slit

Explanation / Answer

(theta) = n(lambda)/d = y/D
y = n(lambda)D/d

1. lambda_blue<lambda_red
y_blue < y_red
A) Blue fringed would be closer together than the red finges
2. E) The peaks of the diffraction grating are much farther apart than for the double-slit

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