Which principle allows corrective lens grinding, pioneered by Ibn al-Haytham, to focus light rays,?

💡 Explanation

When light passes through a lens, refraction occurs because the speed varies across material resulting in bending the rays and different focal points. Therefore, refractive index variation drives focusing, rather than aberration control which minimises distortions, or Reflection which guides light via internal effects , or manipulation which alters electromagnetic waves .

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