One example of a parallel beam of light is sunlight reaching the Earth's surface, as the rays from the Sun are nearly parallel due to the vast distance between the Sun and Earth. Another example is laser light, which is produced by stimulated emission and consists of highly coherent and parallel rays due to the nature of the laser's construction and operation.
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Differential beam bending is when the beam is being bent at equally but at opposite sides. The beam can be bend in separate areas of a single beam or be two different parallel beams.
The circles could be in 2 planes that are parallel to each other. Lines and planes can be parallel. Lines of latitude are examples of circles that are in parallel planes.
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Perpendicular lines or parallel lines are two examples
When a base is congruent it is the same shape and size, and parallel is when they will never touch. Therefore, on a square the top and bottom are congruent parallel bases. Some other examples are: Cylinders, rectangular prisms, and of course parallelograms.