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    hi there, do the light rays entering the convex lens always have to be parallel to one another? is this important? if so, why?
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    They don't have to be parallel to each other.

    But if they ARE parallel, then when refracted they will pass through the principal focus / focal point.
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    (Original post by phys981)
    They don't have to be parallel to each other.

    But if they ARE parallel, then when refracted they will pass through the principal focus / focal point.
    thanks so much
 
 
 
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