Question

a parallel beam of monochromatic light is allowed to be incident normally on a plane transmission grating having 5000 lines per cm and second order spectral line is found to be diffracted through 30 degree . calculate the wave length of light ?​

Answer 1

Explanation:

Given a parallel beam of monochromatic light is allowed to be incident normally on a plane transmission grating having 5000 lines per cm and second order spectral line is found to be diffracted through 30 degree . calculate the wave length of light ?

• Given grating transmission d = 1/5000 cm
• Line diffracted = 30 degree
• So sin 30 = ½  
• So m = 2
• So λ is wavelength of light
• So d is the grating element
• Theta is angle of diffraction of n th order.
• So n is the order of spectrum
• So wavelength of light λ = d sin theta / n
•                                              = 1/5000 x ½ / 2
•                                              = 1/5000 x ½ x ½  
•                                                = 5 x 10^-5 cm

Reference link will be

https://brainly.in/question/13742522

Answer 2

Answer:

5x will be the answer .......