Which one of the following types of glass can cut ultraviolet?
Correct answer: D. Crookes glass
- A. Jena glass
- B. Soda glass
- C. Pyrex glass
- D. Crookes glass
Explanation
Crookes glass contains compounds that absorb or reduce ultraviolet radiation, so it is used to cut UV rays. Pyrex is valued mainly for heat resistance, while soda glass is ordinary common glass.
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Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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