Question

Lens is made up of which glass
A) Ordinary glass
B) Pyrex glass
C) Flint glass
D) Cobalt glass

Answer 1

Answer: The correct answer is option   C) Flint glass

Explanation:

A lens is a transmissive optical device that focuses or disperses a light beam by the process of refraction.

Flint glass is used as an optical glass because it has relatively high refractive index and low Abbe number than other materials.

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Answer 2

Answer:

The correct answer  

C) Flint glass

Explanation:

• Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape.
• Lenses form images by refracting rays emanating from the object. Refraction on the other hand depends on refractive index of the material that lens is made of.
• Since in this case lens is made of two different materials- glass, and plastic, it should, in principle, make two images.