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nlexa [21]
3 years ago
13

What is the wavelength of the light entering an interferometer if 402 bright fringes are counted when the movable mirror moves 0

.115 mm?
Physics
1 answer:
rusak2 [61]3 years ago
8 0

Answer:

The  value is  \lambda  = 572 *10^{-9} \ m

Explanation:

From the question we are told that

    The  number of  bright fringes is  n =  402

     The  displacement of the mirror is  \delta l  =  0.115 \ mm = 1.15 *10^{-4} \  m

 

Generally the number of fringes is mathematically represented as

       n  =  \frac{2 *  \delta  l }{\lambda }

=>    \lambda  =  \frac{2 *  \delta  l }{n }

=>     \lambda  =  \frac{2 *  1.15*10^{-4} }{402 }

=>   \lambda  = 572 *10^{-9} \ m

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