All lenses are transparent and refract light, including the lenses in our eyes. Many of us rely on corrective lenses to function normally. Concave or convex lenses are available. The shape of a lens determines the images it creates.
Light waves refract outward or spread out when parallel rays of light enter a concave lens. Light rays refract twice: once when they enter the lens and again when they exit. Only light rays passing through the lens's center remain straight.
Check out the video to learn how different lenses form images by refracting light!

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