Thank You

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Experiment O-4

Interface

by

DavidTurner

Feburary 18, 2013

Physics II Lab

Objective

Determine the wavelength of a laser beam from the interference pattern produced when passed through a double slit.

Materials

Measuring microscope
Laser double slit
Meter stick
Stand
Clamp

Theory

What are the properties of light? Explain the phenomenon of interface and how interface patterns are formed when light passes through slits

Calculate the wavelength , ,which is given by the equation

ƛ= b * d

D

Experimental Procedure

1. Study the construction and operation of the measuring microscope and learn how to take accurate readings using he venier.

2. Keep the microscope vertical. Place the double slit under the microscope such that the slits are perpendicular to the direction of movement of the microscope. Adjust the focus and the cross line controls to get a sharp view of the slits and the cross lines. Adjust the position of the microscope such that the cross lines coinciding with the edge of a slit

3. Take the reading accurately using the venier (R1). Similarly move the microscope to get the cross line coinciding with the other three edges of the slits and take the readings (R2, R3, R4).

4. Calculate the center distance (b) between the slits from the four readings

5. Repeat steps 2, 3, and 4 and take the average of three consistent values of b

6. Mount the slit vertically on the table and place he laser such that the beam passes through the double slit and form fringes on a screen or a wall. Adjust the distance between the slit and the screen or wall to be as large as possible a least about 2 meters. Measure the exact distance (D).

7. Hold a sheet of paper on the screen or wall and trace the paper he bright fridges. Measure the center to center distance between the fridges and…...

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