Examlex
For Mercury, the tidal stress of the Sun is much greater at aphelion than at perihelion.
Optical Instrument
An optical instrument is a device designed to manipulate light in order to view or analyze objects with enhanced detail.
Refraction
The bending of light by the cornea, lens, and eye fluids to focus light onto the retina.
Specific Gravity
A measure of the density of a substance compared to the density of water.
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