PHYSICS LAB MANUALS

Fresnel Bi-prism

Sl. No.

Required item

Utility

1

Optical rail

Holding the entire system

2

Sodium vapour lamp

Acting as a source of monochromatic light.

3

Rectangular slits

Creating a thin source of light(cylindrical wavefronts)

4

Screen

For finding d, via displacement method

5

Bi prism

Creating two virtual sources from the slit.

6

Convex lens

Finding the distance between the two virtual sources

7

Micrometer eyepiece

Observing and measuring the fringe width

8

Four optic bench mounts

Mounting the slit, bi-prism, convex lens, travelling micrometer eyepiece

Experimental Set-Up
Figure 1:Experimental Set-Up.

Experimental Set-Up
Figure 2: The Ray Diagram. S is the source slit. S1and S2are the virtual sources. Angle of bi prism is α~1°

Experimental Set-Up
Figure 3: Measuring separation distance of the virual slits using displacement method

Experimental Set-Up
Figure SEQ Figure \* ARABIC 4: Fringe pattern as seen through eyepiece