Question

what is difference between haidenger and fezeau fringes?

Answer 1

Haidinger fringes

1. They are also known as fringes of equal inclination

2.formed by the interference of coherent monochromatic light

3. They contain visible alternate dark and bright fringes.

4.They are produced when light fall on a thin film of oprltically denser medium.

5. Example : Michelson interferometer.

Fezeau fringes

1. Also known as fringes of equal thickness

2. This interference pattern is due to the contact between two surfaces

3. If surfaces are perfectly flat, a pattern of concentric dark and light circles are observed called Newtons rings.

4. When the surfaces are separated by wedge shaped films we get fizeau fringes.

5. Commonly used to measure the shape of optical surfaces.