how many orders will be observed by a grating having 4000lines per cm

1.	how many orders will be observed by a grating having 4000lines per cm if it is illuminated by light of wavelength in the range 5000A to 7500A
Answer» Answer: GRATING equation is (a+b) sinθ =nλ , N= 4000 lines/cm For maximum orders sinθ = 1 Therefore , nmax=(a+b)λ=1Nλ For 5000 Å, nmax=14000×5000×10−8=5. For 7500 Å, nmax=14000×7500×10−8=3 So, in the wavelength range, 5000 to 7500 Å ,the observed number of orders range between 3 to 5 hope it helps you... mark as BRAINIEST plzz....

how many orders will be observed by a grating having 4000lines per cm if it is illuminated by light of wavelength in the range 5000A to 7500A

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Answer:

GRATING equation is (a+b) sinθ =nλ , N= 4000 lines/cm

For maximum orders sinθ = 1

Therefore , nmax=(a+b)λ=1Nλ

For 5000 Å, nmax=14000×5000×10−8=5.

For 7500 Å, nmax=14000×7500×10−8=3

So, in the wavelength range, 5000 to 7500 Å ,the observed number of orders range between 3 to 5

hope it helps you...

mark as BRAINIEST plzz....

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how many orders will be observed by a grating having 4000lines per cm if it is illuminated by light of wavelength in the range 5000A to 7500A

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