Question -
The type of glass used in making lenses and prisms is
Options:
A .  Jena glass
B .  Soft glass
C .  Pyrex glass
D .  Flint glass
Answer: Option D In the optical glass industry, flint glass is any highly refractive lead-containing glass used to make lenses and prisms. Because it absorbs most ultraviolet light but comparatively little visible light, it is also used for telescope lenses.
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