Question

A single slit of width 0.45 mm is illuminated with monochromatic light (λ = 650 nm). A screen is placed 2.70 m from the slit to observe the fringe pattern. What is the distance from the main principle axis and the third dark fringe? Answer in cm.

Answer #1

*Answer:- *
Distance :

*Explanation:-*

Let,

- : be the width of the single slit.
- : be the distance between screen and slit.
- : be the required distance from the principle axis to third dark fringe.

Given:-

The distance from the main principle axis to the third dark fringe is given by,

Where, m is an integer which shows number of dark fringes. For third dark fringe value of m is 3,

**This is the distance from the main principle axis and
the third dark fringe.**

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