Type of glass used in optical work is the ___________________ glass?
Correct answer: C. Lead
- A. Soda-lime
- B. Fibre
- C. Lead
- D. Borosilicate
Explanation
Lead glass, also called flint glass, has a high refractive index and is therefore useful in lenses and other optical work. Soda-lime glass is common window glass, while borosilicate is selected mainly for thermal and chemical resistance.
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