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What are anastigmatic lenses ?...

What are anastigmatic lenses ?

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The lenses which have been duly corrected for most of the optical defects of images formed by them are called anastigmatic lenses.
These lenses are used in good quality optical instruments like camera, microscope, telescope, binoculars, etc.
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Knowledge Check

  • The chromatic aberration in lenses is due to

    A
    Dissimilarity of main axis of rays
    B
    Dissimilarity of radii of curvature
    C
    Variation of focal length of lenses with wavelength
    D
    None of these

  • Assertion : When two lenses are used to make achromatic lens combination then the materials of the two lenses are always different. Reason : Dispersive power of the materials of the two lenses must be of opposite sign to become achromatic combination.

    A
    If both assertion and reason are correct and rason is a correct explanation of the assertion.
    B
    If both assertion and reason are correct but reason is not the correct explanation of assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    If assertion is incorrect but reason is correct.

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