Question

Which lamp is used in the Newton-Ring experiment?

Answer 1

In the Newton-Ring experiment, a monochromatic light source is used, typically a sodium lamp or a laser.

1. Sodium Lamp: This lamp emits yellow light with a specific wavelength (around 589 nm), which is commonly used in the experiment because it's relatively easy to produce clear and distinct rings with its single wavelength.
   

1. Laser: In modern setups, a laser is often used because it provides coherent, monochromatic light with a very narrow wavelength range. This makes the rings sharper and more visible.
   

The key is that the light used in the experiment must be monochromatic (of a single color), so it produces clear interference patterns, which are essential for observing the Newton rings.