How can u distinguish concave and cinvex lens without touching them?
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Light - Reflection and Refraction. How will you distinguish between a convex and a concave lens without touching them? Convex and concave lens can be distinguished by touching them. If the curved surface is bulging outwards then it's convex lens and if the curved surface is curved inwards then it's concave lens.
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We can differentiate between a convex and concave lens by seeing the image.
- On keeping the lens near a printed page, if letters appear magnified, the lens is convex and if the letters appear diminished, the lens is concave.
- On seeing a distant object through the lens, if its inverted image is seen, the lens is convex and if an upright image is seen, the lens is concave.
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