In a Young experiment two slits are speared by 6(um), the third dark fringe is formed at an angle 5.6°. The distance between slits and viewing screen is 2 (m). A- What is the frequency of light used for this experiment?
B- What is the distance between second bright fringe and central fringe?

A) f = 1.28x10¹⁵ Hz

B) y = 0.20 m

Explanation:

A) The frequency of light can be found as follows:

Where:

c: is the speed of light = 3.0x10⁸ m/s

λ: is the wavelength

The wavelength can be calculated using the following equation:

Where:

m = 3, d = 6 μm, θ = 5.6°        

Now, the frequency is:

Hence, the frequency of light used for this experiment is 1.28x10¹⁵ Hz.

B) The distance between the second bright fringe and central fringe (y) is:

Therefore, the distance between the second bright fringe and central fringe is 0.20 m.

I hope it helps you!

explanation:

an enlarged virtual image is the answer