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Explain Cartesian sign convention in cas...

Explain Cartesian sign convention in case of refraction through lens.

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Cartesian sign conventions for lens:


i. Optical centre (0) of a lens is taken as origin and principal axis oflens is taken as X-axis.
ii. All distances measured to the right of the origin are taken as positive, while distances measured to the left of the origin are taken as negative.
iii. Distances measured perpendicular to and above the principal axis are taken as positive.
iv. Distances measured perpendicular to and below the principal axis are taken as negative.
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Knowledge Check

  • According to Cartesian sign convention, in ray optics

    A
    all distances are taken negative
    B
    all distances in the direction of incident ray are taken positive
    C
    all distances are taken positive
    D
    all distances in the direction of incident ray are taken negative
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