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A projector lens has a focal length 10 c...

A projector lens has a focal length 10 cm.It throws an image of a `2cmxx2cm` slide on a screen 5 mater from the lens.Find (i) the size of the screen and (ii) the ratio of illumination of the slide and of the picture on the screen
2401

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Knowledge Check

  • A projector lens has a focal length of 10 cm. It produces a real image of a 2cm xx 2 cm slide on a screen 5 metre from the lens. What is the size of the picture on the screen ?

    A
    `49 cm xx 49 cm `
    B
    `24 cm xx 24 cm `
    C
    `98 cm xx 98 cm `
    D
    `75 cm xx 75 cm `

  • A slide projector gives magnification of 10. If it projects a slide of 3 cm xx 2 cm on a screen, the area of image on screen is :

    A
    `6000cm^(2)`
    B
    `600cm^(2)`
    C
    `3600m^(2)`
    D
    `2000m^(2)`

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