Question

Red light is generally used to observe diffraction
pattern from single slit. If green light is used instead
of red light, then diffraction pattern:
chee
(1) Will be more clear
(2) Will be contract
(3) Will be expanded
(4) Will not visualize​

Answer 1

Hello mate

In a single slit diffraction, angular width of diffraction pattern sin θ=

b

λ

Since, wavelength of blue light is less than that of red light, so angular width of diffraction pattern is less when blue light is used. So the diffraction pattern becomes narrower.

Answer 2

Answer:

If green light is used instead of red light, then diffraction pattern is (2) will be contract.

Explanation:

• The diffraction pattern is defined as the pattern that is created by the waves which passes through the slit.
• It has a width “a” which is larger than lambda.
• It helps in understanding the series that are imaginable in a series of the point sources such that all the phases is seen along with the width of the slit.

• There are two types of diffraction pattern:

1) Fraunhofer

2) Fresnel

• The diffraction pattern occurs due to the following reason:

When a light is applied, the diffraction of light that will occur only when alight wave will pass by corner or through an opening or the slit that is in size of smaller when compared to the light wavelength.

We can understand that, the wavelength blue is greater than wavelength red.

By applying the the fringe pattern is given as:

β= D/dλ

Here, β is beta

D is distance

Λ is wavelength

From the above equation we conclude that,  fringe pattern will contract because fringe width ∝λ.

Therefore, it occurs due to when a green light is used instead of red light then diffraction pattern  is (b) will be contract.

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