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What is a bifocal lens ?...

What is a bifocal lens ?

Text Solution

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A biofocal lens is a lens of which the upper part is a concave lens to correct myopia and the lower part is a convex lens to correct hypermetropia.
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Knowledge Check

  • An object placed at 20 cm from a lens, forms an image on a screen placed 60 cm on the other side of the lens. What is the focal length and type of the lens ?

    A
    15 cm and convex lens
    B
    `-15` cm and concave lens
    C
    18 cm and convex lens
    D
    `-18` cm and concave lens

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    An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens?

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