For each statement below, select True or False. When a diffraction grating is il
ID: 1497576 • Letter: F
Question
For each statement below, select True or False. When a diffraction grating is illuminated by white light, the first order maximum for green light is closer to the central maximum than the first order maximum for red light. Red light strikes two narrow slits and an interference pattern is observed on a screen. As the distance separating the two narrow slits is increased, the interference pattern observed on the screen will get narrower. As the wavelength of light hitting a single slit is decreased, the diffraction pattern observed on a screen will get wider. Tries 0/4Explanation / Answer
from the diffraction formula
theta= sin^-1 ( lamda/d)
wave lenght of green is less than the red light so
theta_gree < theta_r
answer is true
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d sin theta = m Lamda
d ( y/L) = m * lamda
y = m lamda L/d
if d decreases then y increases so state ment is false
(3)
y = L * lamda/a
lamda decrease y decreases so statemtn is false
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