Scribd
Upload
1K views3 pages

5: Edser'S A' Pattern: Actual Setup: Https://Youtu - Be/Ruksrcv8Of0

The document describes an experiment to determine the wavelength of light from a sodium source using diffraction. It involves using an "A" pattern plate and wire gauze to observe diffraction patterns. Measurements are made of the length of the "A" pattern cross bars, the spacing between wires in the gauze, and the distance between the "A" pattern and gauze. These measurements are then used in an equation to calculate the wavelength of the sodium source.

Uploaded by

Neelam Kapoor
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
1K views3 pages

5: Edser'S A' Pattern: Actual Setup: Https://Youtu - Be/Ruksrcv8Of0

The document describes an experiment to determine the wavelength of light from a sodium source using diffraction. It involves using an "A" pattern plate and wire gauze to observe diffraction patterns. Measurements are made of the length of the "A" pattern cross bars, the spacing between wires in the gauze, and the distance between the "A" pattern and gauze. These measurements are then used in an equation to calculate the wavelength of the sodium source.

Uploaded by

Neelam Kapoor
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
You are on page 1/ 3

    5: Edser’s ‘A’ pattern

Theory : https://youtu.be/dNjJzCs17b0

Actual Setup : https://youtu.be/rUksrcv8Of0

Marks Marks
Allotted Scored
1 You are given a glass plate of ‘A’ pattern, determine the length l of
the cross bars of ‘A’ using the travelling microscope. 15
2 Determine the gauze element d of the given wire gauze by measuring
the spacing between four successive vertical wires, at least four times
for each. Find mean d 25
3 Place the ‘A’ pattern plate in the inverted position ( ) at a short
distance from the Na- source. Keep the telescope little beyond 2
meters away from the ‘A’ pattern and focus it on ‘A’ (A real and
inverted image of the inverted will be observed). Introduce the wire
gaze with its plane perpendicular to the axis of the telescope and close
to the telescope objective. A number of secondary images of ‘A’ (due
to diffraction) along with the principal or primary image of ‘A’ will be
observed. Adjust the position of the wire gauze, till the point of
intersection of the first pair of secondary image of ‘A’ lies at the mid-
point of the bar of the principal image of ‘A’ 15
4 The right leg of the first A to the left of the direct image should cut the
left leg of the first A to the right of the direct image, on the cross bar
of the direct image.
Measure the distance ‘D’ between the plane of the ‘A’ pattern plate
and the wire gauze when shifting the wire gauze toward A pattern and
away from the A pattern. 
Find the mean distance D. 15
5 Calculate the wavelength λ of the Na source using the relation: 

  λ = 
where, λ→  wavelength of light (monochromatic) in cms, 
 l → length of the cross bar of ‘A’,      d →element of wire gauze & 10
 D → distance between the ‘A’ pattern and the gauze
6 Total  80
7 Journal 10

8 Viva 10

9 Paper Total 100


l=

d1
=

d2

D1 =250 cm D2=180 cm
Calculate wavelength of source.

You might also like