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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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