Why does lemon appears large in water
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Light can travel through transparent (see-through) materials like glass, plastic or water, but it does not pass through them unchanged. The transparent material has a different density than the air it is traveling in, causing the light to change direction inside of it. This is called refraction: its why observations made through water are distorted or offset and it is also how lenses work.
In a lens, light is refracted different ways depending on the curvature of the surface and the material's properties. Under the right conditions, these materials can bend light rays to make things look bigger than they are (they can magnify). Many optical devices (binoculars, eye glasses, telescopes, and microscopes) use the same basic ideas of bending light to fool your eye and brain so it appears to come from larger or closer objects. The magnification depends on the distances between the lens and the image and the lens and the object.
In a lens, light is refracted different ways depending on the curvature of the surface and the material's properties. Under the right conditions, these materials can bend light rays to make things look bigger than they are (they can magnify). Many optical devices (binoculars, eye glasses, telescopes, and microscopes) use the same basic ideas of bending light to fool your eye and brain so it appears to come from larger or closer objects. The magnification depends on the distances between the lens and the image and the lens and the object.
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because The green rays indicate the normal path of the light rays in the absence of water in the tumbler .
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