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    Question

    Lens is made up of

    –
    A Pyrex glass Correct Answer Incorrect Answer
    B Flint glass Correct Answer Incorrect Answer
    C Ordinary glass Correct Answer Incorrect Answer
    D Cobalt glass Correct Answer Incorrect Answer

    Solution

    Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion). A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their compensating optical properties, which reduces chromatic aberration (colour defects). 

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