what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
a concave lens diverge light rays coming from
an objects, it refract the light rays and form images , they are thinner at the
center than at the edges.
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