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Irina18 [472]
2 years ago
11

A laser of wavelength 720 nm illuminates a double slit where the separation between the slits is 0.22 mm. Fringes are seen on a

screen 0.85 m away from the slits. How far apart are the second and third bright fringes
Physics
1 answer:
kumpel [21]2 years ago
8 0

Answer:

The appropriate solution is "2.78 mm".

Explanation:

Given:

\lambda = 720 \ nm

or,

  = 720\times 10^{-9} \ m

D=0.85 \ m

d = 0.22 \ mm

or,

  =0.22 \times 10^{-3} \ m

As we know,

Fringe width is:

⇒ \beta=\frac{\lambda D}{d}

hence,

Separation between second and third bright fringes will be:

⇒ \theta=\beta=\frac{\lambda D}{d}

       =\frac{720\times 10^{-9}\times 0.85}{0.22\times 10^{-3}}

       =2.78\times 10^{-3} \ m

or,

       =2.78 \ mm

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Part B. we are asked to determine the velocity if there is air drag. To do that we will use the following formula:

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\begin{gathered} \rho_{water}=\text{ density of water} \\ V=\text{ volume} \end{gathered}

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