General Science Question: Download Questions PDF
A mixture of turpentine, ether, camphor gum, and powdered emory, was historically used for which of the following:
Answer:
1. sealing mirrored surfaces
2. grinding glass surfaces
3. gluing glass plates together
4. coating lenses for chromatic aberration
Answer: B
2. grinding glass surfaces
3. gluing glass plates together
4. coating lenses for chromatic aberration
Answer: B
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