Question

in a biprism expt., the distance of 20th bright band from centre of interference pattern is 8mm.calculate distance of 30th bright band from centre.

Answer 1

Answer on Question #63726, Physics / Optics

Question:

In a biprism expt., the distance of 20th bright band from centre of interference pattern is 8mm. Calculate distance of 30th bright band from centre.

Solution:

Here is the scheme for this experiment:

The source of light C is a narrow slit. The angle $\alpha$ is very small and the interference occurs from two imaginary sources, $C'$ and $C''$ .

Let $h$ be the distance between imaginary sources, $L$ — the distance from the slit to the screen, $X$ — the distance of the $n^{\text{th}}$ bright band from the centre, and $\lambda$ — wavelength of the light.

These parameters connected by this relation:

For $20^{\text{th}}$ bright band

For $30^{\text{th}}$ bright band

We may express unknown parameters this way: - —, and insert it into second formula:

mm,

Answer:

http://www.AssignmentExpert.com