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Question

The lens is made up of which glass


A

Ordinary Glass

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B

Pyrex Glass

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C

Flint Glass

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D

Cobalt Glass

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Solution

The correct option is C

Flint Glass


The explanation for the correct answer:

Option C: Flint Glass

  1. A lens is an optical device that disperses or focuses light through the refraction process.
  2. The material used for the lens needs to have a high refractive index and low Abbe number.
  3. Flint Glass is a material that has these specific properties and is used to make a lens that has a refractive index 1.65 and abbe number is nearly 50
  4. Hence, option C is correct.

The explanation for the incorrect answer.

Option A: Ordinary glass

  1. The Refractive index of ordinary glass is 1.5 which is considered to be low, so we don't use ordinary glass in lens making.
  2. Hence, option A is incorrect.

Option B: Pyrex glass

  1. The Refractive index of Pyrex glass is 1.47 which is considered to be low, so we don't use ordinary glass in lens making.
  2. Hence, option B is incorrect.

Option D: Cobalt glass

  1. Even though cobalt glass has a high refractive index of 2.13, the abbe number is also high, so it is not used in making lenses.
  2. Hence, option D is incorrect.

Thus, option C is the correct answer.


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