Physics
The diagram shows straw partially immersed in water in the glasses.
(a) Why does the straw in water appear thicker as compared to the straw outside water?
(b) Why does the straw appear discontinuous in water?
Refraction Plane Surfaces
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Answer
(a) The surface of the glass with water is curved so it acts like a convex lens. Thus, due to the refraction through a convex lens it appears bigger (thicker).
(b) Due to refraction, when light passes through water, lateral displacement takes place which shifts the position of the image and makes it appear discontinuous.
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