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A screen is placed at a …

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A screen is placed at a distance of 100cm from an object. The image of the object is formed on the screen by a convex lens for two different locations of the lens separated by 20cm. Calculate the focal length of the lens used.

    • Posted by Hetvi Shah 6 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Sayeda Iram Ateeq 6 years, 10 months ago

    F=D^2 - d^2 ÷ 4D [D=100cm, d= 20cm] F= 100^2 - 20^2÷ 4×100 = 10000-400÷400 F= 24cm

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