reflect light well-normally shinysmooth pale colour objects: mirror, glass, shiny metal, tin foil...these objects favour a good image due to the reflection of light is regular do not reflect light well-usually rough, matt , dark colured objects: tree trunk, car wheel, dark carboard, brick, stone, dark opaque plastic... These objects diffuse the picture or do not giva a picture at all because reflected light is irregular.
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a lens will refract light. a mirror will reflect the light.
Machines are inanimate. Machines do not eat, sleep, rest, breathe, and they do not have a heart beat. Machines are just objects, inanimate objects for the use of humans.
studying about stable objects. i think
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A pulley is the best way.