A convex lens forms an image because it:

bends rays toward the axis so they meet

Which are uses of lenses?

measuring electric current directly

Best grade 9 summary for lenses:

lenses shape images by refraction at curved surfaces

A flat glass window can still refract light, but the ray often exits:

parallel to the incoming ray (shifted sideways)

Lenses & Refraction Quiz: Convex/Concave, Focus, Everyday Vision

Grade 9th

Reviewed by Ekaterina Yukhnovich

Ekaterina Yukhnovich, PhD |

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Ekaterina V. is a physicist and mathematics expert with a PhD in Physics and Mathematics and extensive experience working with advanced secondary and undergraduate-level content. She specializes in combinatorics, applied mathematics, and scientific writing, with a strong focus on accuracy and academic rigor.

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By Thames

Thames

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| Attempts: 28 | Questions: 20 | Updated: Mar 6, 2026