❓ why
Why do lenses bend light to form images?
Quick Answer
Lenses bend light because their curved surfaces and different refractive index from air change the path of light rays. Convex and concave shapes make rays converge or diverge, forming images.
The Full Story
A lens works by refraction, the bending of light as it passes between materials with different optical densities. A convex lens focuses parallel rays to a point, while a concave lens spreads them apart. This ability to control light is the basis of eyeglasses, cameras, microscopes, and telescopes. The image formed depends on the lens shape, focal length, and the object’s distance from the lens.
Key Facts
1.Refraction changes a light ray’s direction
2.Convex lenses converge light and concave lenses diverge it
3.Lenses are used in glasses, cameras, microscopes, and telescopes
YouTube Angle
Suggested video title for this topic:
"Why can a curved piece of glass make a sharp image?"
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