Which one of the following types of glass can cut off ultraviolet rays?

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Q: 28 (IAS/2007)
Which one of the following types of glass can cut off ultraviolet rays?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,21,50,9,37,4,21

keywords: 

{'jena glass': [0, 0, 1, 0], 'pyrex glass': [0, 0, 0, 1], 'soda glass': [0, 0, 1, 1], 'ultraviolet rays': [0, 0, 1, 0], 'glass': [0, 0, 1, 4], 'crookes glass': [0, 0, 1, 1], 'types': [11, 3, 20, 23]}

Crookes glass is the correct answer because it is specifically designed to cut off ultraviolet rays. This type of glass was created to protect the eyes from harmful UV rays, which makes it common in the creation of eyewear and lenses.

Option 1, Soda glass, is primarily used for windows and containers; it does not cut off ultraviolet rays. Option 2, Pyrex glass, is a brand of borosilicate glass that is known for its high thermal resistance; it`s not designed to block ultraviolet rays. Option 3, Jena glass, is a type of borosilicate glass well known for its thermal resistance and chemical stability; yet again, it is not specifically designed to block ultraviolet rays.

Therefore, Crookes glass, which specifically blocks UV rays, is the correct answer.

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