Answer:
The Short Answer:
TELESCOPE
Early telescopes focused light using pieces of curved, clear glass, called lenses. However, most telescopes today use curved mirrors to gather light from the night sky. The shape of the mirror or lens in a telescope concentrates light. That light is what we see when we look into a telescope.
MICROSCOPE
A microscope is an instrument that can be used to observe small objects, even cells. The image of an object is magnified through at least one lens in the microscope. This lens bends light toward the eye and makes an object appear larger than it actually is.
PERISCOPE
A periscope lets you look around walls, corners or other obstacles. ... In a periscope, light from an object strikes the top mirror at 45° and bounces off at the same angle. This sends light directly down the tube and onto the lower mirror. This mirror, also at a 45° angle, reflects light directly to your eye.
BINOCULARS
In basic terms, binoculars are two simple telescopes set side by side so each eye can view through one. The objective lens brings in light, capturing the image and sending it to the eyepiece lens where it gets magnified for your viewing pleasure.
ENDOSCOPE
An endoscope is a thin, flexible tube with a light and a tiny camera on the end. The doctor inserts it into the mouth, down the throat, and into the esophagus. ... During an upper endoscopy, the doctor can pass tools through a channel in the endoscope to remove tissue samples.
PERISCOPE
A periscope lets you look around walls, corners or other obstacles. ... In a periscope, light from an object strikes the top mirror at 45° and bounces off at the same angle. This sends light directly down the tube and onto the lower mirror. This mirror, also at a 45° angle, reflects light directly to your eye.
SPECTROMETER
The basic function of a spectrometer is to take in light, break it into its spectral components, digitize the signal as a function of wavelength, and read it out and display it through a computer. ... In most spectrometers, the divergent light is then collimated by a concave mirror and directed onto a grating.
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