Today's Rocket Words: Your 5 words and meanings to learn

convex lens

a lens that is thicker across its middle; it will converge rays of light that travel parallel to its principal axis

concave lens

a lens that is thinner across the middle and causes rays to diverge

refraction

the changing in direction of a wave due to a change in medium

focal point

the point at which parallel rays or waves converge after reflection or refraction, or the point from which diverging rays or waves appear to proceed

parallel

two lines which are side by side and always the same distance apart

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