The type of high refractive index glass used in optical instruments is _____________ glass?
Correct answer: B. Flint
- A. Pyrex
- B. Flint
- C. Crookes
- D. None of these
Explanation
Flint glass contains lead oxide, which gives it a high refractive index and strong dispersion, making it useful in optical instruments. Pyrex is valued mainly for thermal resistance, not high refractive index.
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