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Physics
Physics
Problem
2. A diffraction grating of 1000 lines
/
c
m
/ \mathrm{cm}
/
cm
has red light of wavelength 700 nm pass through it. The distance between the first and third principal bright spots on a screen 2 m away is A) 14 cm B) 28 cm C) 42 cm D) 140 cm
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