Which glass is usually used in optical work ?
Correct answer: C. Photo-sensitive glass
- A. Lead glass
- B. High silica (borosilicate) glass
- C. Photo-sensitive glass
- D. Fibre glass
Explanation
Photosensitive glass changes its structure or optical properties when exposed to light and is used in specialised optical applications. Borosilicate glass is principally selected for heat and chemical resistance, while fibre glass is used for reinforcement.
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