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What is meant by optical centre of a len...

What is meant by optical centre of a lens?

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The optical centre of a lens is a point on the principal axis of the lens, such that a ray of light passing through it goes undeviated.
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Knowledge Check

  • If the optic axis of convex and concave lenses are separated by a distance 5 mm as shown in the figure. Find the coordinate of the final image formed by the combination if parallel beam of light is incident on lens. Origin is at the optical centre of convex lens

    A
    `(25 cm,0.5cm)`
    B
    `(25 cm,0.25 cm)`
    C
    `(25 cm,-0.5 cm)`
    D
    `(25 cm,-2.5 cm)`

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    What is meant by power of a lens ? Write its SI unit. A student uses a lens of focal length 40 cm and another of -20 cm. Write the nature and power of each lens.

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