Question

The image below shows a laser that has been shot into a solid block of transparent plastic from the far left end. Once inside the plastic block, the light is repeatedly reflected off of the sides until it reaches the opposite end, on the right.



The picture above demonstrates how
A.
electricity is transmitted from a solar power plant to residential homes.
B.
optical fibers transmit light signals in high-speed communications.
C.
solar cells transform light energy into electrical energy.
D.
satellites communicate with ground controllers from outer space.
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Answer 1

B.

The repeated reflections inside the block illustrate total internal reflection, which is how optical fibers confine and guide light for high-speed communications.