Optical Instruments

noun an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses or curved mirrors and sometimes a combination of both

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• The astronomer used a powerful telescope to observe distant galaxies.
• I borrowed my friend's telescope to stargaze last night.
• Check out this sick telescope I scored at the thrift store!
• Through the telescope of history, we can see the impact of past events on our present.

noun a device used to measure the refractive index of a substance

• The scientist used an abbe refractometer to measure the refractive index of the liquid sample.
• I borrowed my friend's abbe refractometer to check the purity of the oil.
• I gotta get my hands on an abbe refractometer to test this stuff out.
• Using an abbe refractometer, she could see through the lies and deception.