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In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then

a)

Fringes will become narrower

b)

Fringes will become broader

c)

No change in fringe width

d)

None of the above


Question ID - 150044 | Top Ranker Answer | SaraNextGen

In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then

a)

Fringes will become narrower

b)

Fringes will become broader

c)

No change in fringe width

d)

None of the above

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

Width of central maximum is given by

Where  is focal length of lens, a is width of slit and  is wavelength of light used.

From Eq. (i), it is clear that fringe width

So, when blue light is used in the experiment instead of red light, the fringes will become narrower.



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