Precision Fresnel Biprism Interference Apparatus

The Fresnel's Biprism Experiment is designed to demonstrate interference by division of wavefront using Fresnel's biprism. The apparatus enables students to generate and observe interference fringes produced by two virtual coherent light sources. A precision optical bench and accurately aligned optical components ensure easy setup, precise measurements, and clear observation of the interference pattern, making it an ideal experiment for optics laboratories. Manufactured by Atico Export India.

Principle

Fresnel's Biprism Experiment demonstrates interference by division of wavefront. Light from a narrow slit passes through a biprism consisting of two thin prisms joined together, producing two virtual coherent light sources. These virtual sources generate equally spaced interference fringes when their light waves overlap. A convex lens and micrometer eyepiece are used to observe and accurately measure the fringe spacing.

Objectives

• Study interference by division of wavefront.
• Generate interference fringes using Fresnel's biprism.
• Measure the fringe width accurately.
• Understand the formation of virtual coherent light sources.
• Verify the principles of optical interference.

System Components

Optical Bench :

• 1000 mm
• Quantity: 1

Lateral Adjustment Riders :

• Quantity: 2

Plain Riders :

• Quantity: 2

Sodium Lamp :

• 20 W, 110 V
• Quantity: 1

Adjustable Slit :

• Quantity: 1

Adjustable Biprism Carrier :

• Quantity: 1

Plain Lens Carrier :

• Quantity: 1

Adjustable Eyepiece Carrier :

• Quantity: 1

Micrometer Eyepiece :

• Quantity: 1

Ground Glass Screen :

• Quantity: 1

Eyepiece Adapter Ring :

• Quantity: 1

Height Fixing Collar :

• Quantity: 3

Biprism :

• Quantity: 1

Convex Lens :

• Focal Length: +150 mm
• Quantity: 1

Precision Optical Bench :

• 1 m optical bench provides stable and accurate alignment of optical components.

High-Resolution Measurement :

• Fringe positions can be measured with a precision of 0.01 mm using the micrometer eyepiece.

Easy Optical Alignment :

• Adjustable optical components simplify alignment of the slit, biprism, and virtual light sources.

Stable Experimental Setup :

• Designed for accurate and repeatable interference measurements.