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Screen S is illuminated by two point sou...

Screen S is illuminated by two point sources A and B. Another source C sends a parallel beam of light towards point P on the screen (see figure). Line AP is normal to the screen and the lines AP, BP and CP are in one plane. The distance AP, BP and CP are 3m, 1.5m and 1.5m respectively. The radiant powers of sources A and B are `90` watts and `180` watts respectively. The beam from C is of intensity `20`(watts)`/(m^2)`. Calculate the intensity at P on the screen. `

Answer

Step by step text solution for Screen S is illuminated by two point sources A and B. Another source C sends a parallel beam of light towards point P on the screen (see figure). Line AP is normal to the screen and the lines AP, BP and CP are in one plane. The distance AP, BP and CP are 3m, 1.5m and 1.5m respectively. The radiant powers of sources A and B are 90 watts and 180 watts respectively. The beam from C is of intensity 20(watts)/(m^2). Calculate the intensity at P on the screen. by PHYSICS experts to help you in doubts & scoring excellent marks in Class 12 exams.

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Knowledge Check

  • A photoelectric cell is illuminated by a point source of light 1 m away . When the source is shifted to 2 m then

    A
    Number of electrons emitted is half the initial number
    B
    Each emitted electron carries half the initial energy
    C
    Number of electrons emitted is a quarter of the initial number
    D
    Each emitted electron carries one quarter of the initial energy

  • Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

    A
    points
    B
    straight lines
    C
    semi-circles
    D
    concentric circles

  • If the distance between a point source and screen is doubled, then intensity of light on the screen will become

    A
    Four times
    B
    Double
    C
    Half
    D
    One-fourth

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