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Option 3 : Flint glass
The correct answer is option 3 i.e Flint Glass
Optical glass, also known as flint glass, is softer than any other glass. It is clear and transparent.
The main use of flint glass is in the manufacture of lenses, prisms, and other optical instruments.
These are made from sodium, potassium, and lead silicates.
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 lens.
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