The distance between two slits is 1.2 mm. If the wavelength of light used

Question

The distance between two slits is 1.2 mm. If the wavelength of light used is

4800 ˙ A

and the screen is at a distance of 1 m from the slits, how many fringes are observed on the screen in the space opposite to the slits

Options:

A . 1

B . 2

C . 3

D . 8

Answer: Option C
:
C

y = \frac{d}{2}; y = n β \Rightarrow \frac{d}{2} = n \frac{λ D}{d}

\Rightarrow n = 1.5

∴

the total fringes=3

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