The slit width, when a light of wavelenght 6500Å is incident on a slit, if first minima for red light is at `30^(@)` is

Question

The slit width, when a light of wavelenght 6500Å is incident on a slit, if first minima for red light is at `30^(@)` is

The slit width, when a light of wavelenght 6500Å is incident on a slit, if first minima for red light is at `30^(@)` is
A. `1xx10^(-6) cm`
B. `5.2xx10^(-6) cm`
C. `1.3xx10^(-6) cm`
D. `2.6xx10^(-6) cm`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`lamda=6500A^(@),n=1,a=?theta=30^(@)`
For `n^(th)` mininma, `sintheta=nlamda`
`:.a=(nlamda)/(sintheta)`
`=(1xx6.5xx10^(-7))/(sin30)`
`1.3xx10^(-6)m`

4 views Answered 2023-02-05 15:29