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A slit of width a is illuminiated by whi...

A slit of width a is illuminiated by white light. The first diffraction minimum for light of `lamda=6500 `Å is formed at `theta=30^(@)`, then the width a of the slit is

A

`3250 A^(0)`

B

`1.3` micron

C

`6.5 xx 10^(-4)` mm

D

`2.6 xx 10^(-4)m`

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • A slit of width is illuminated by white light. For red light (lambda=6500Å) , the first minima is obtained at theta=30^@ . Then the value of will be

    A
    3200 Ã…
    B
    `6.5xx10^(-4)mm`
    C
    1.3 micron
    D
    `2.6xx10^(-4)cm`

  • A screen is placed 50 cm from a single slit, which is illuminated with 6000 Å light. If the distance between the first and third minima in the diffraction pattern is 3.00 mm , what is the width of the slit ?

    A
    `1 xx 10^(-4)m`
    B
    `2 xx 10^(-4)m`
    C
    `0.5 xx 10^(-4)m`
    D
    `4 xx 10^(-4)m`

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