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☆☆☆☆☆hot air rises.
a lens is a transparent material that refract slight in a particular way.
to make a hot air balloon rise you use hot air
Forced air heating
wavelength
Convex is an adjective that describes something has a surface or boundary that curves or bulges outward. Convex lens are thicker at the center, they do cause light to converge.
Infrared light is even used to heat food sometimes - special lamps that emit thermal infrared waves are often used in fast food restaurants! Shorter, near infrared waves are not hot at all - in fact you cannot even feel them. These shorter wavelengths are the onesused by your TV's remote control.
a copy of an object formed by reflected or refracted waves of light .
Different waves arrive at a point at the same time.
