A laser beam of wavelength 600 nm falls on a grating having 4000 lines per cm....

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A laser beam of wavelength 600 nm falls on a grating having 4000 lines per cm....

A laser beam of wavelength 600 nm falls on a grating having 4000 lines per cm. If the screen is 2.00 m away from the grating, how far apart will be the two first order images.
(The answer says it is .98m but I got .49m and I have no clue what I did wrong.)

science physics

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Answer 1

Answer #1

0.49 m on each side of central maxima
0.49 m above central maxima and 0.49 m below central maxima

so distance between two first order maxima is 2x0.49 = 0.98 meter

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Answer 2

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A laser beam of wavelength 600 nm falls on a grating having 4000 lines per cm....