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Two polaroids are kept crossed to each o...

Two polaroids are kept crossed to each other. Now one of them is rotated through an angle of `45^(@)` . The percentage of incident light now transmitted through the system is

A

`15%`

B

`25%`

C

`50%`

D

`60%`

Text Solution

Verified by Experts

The correct Answer is:
B
`I = ((I_(0))/(2)) (cos 45^(0))^(2) = (I^(0))/(2) ((I)/(sqrt(2)))^(2) = (I_(0))/(4)`
`rArr I = 25% of I_(0)`
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Knowledge Check

  • Two polaroids are kept crossed to each other . If one of them is rotated an angle 60^@ , the percentage of incident light now transmitted through the system is

    A
    `10%`
    B
    `20%`
    C
    `25%`
    D
    `12.5%`

  • Two polaroids are crossed to each other. One of them is rotated through 60^(@) , what % age of incident unpolarised light will pass through the system ?

    A
    `37.5%`
    B
    `40%`
    C
    `20%`
    D
    `30%`

  • Two polaroids are oriented with their principal planes making an angle of 60^(@) . The percentage of incident unpolarised light, which passes through the system is

    A
    1
    B
    0.5
    C
    0.25
    D
    `12.5%`

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