Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface.
CBSE DELHI - SET 1 2008
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A pencil half immersed in water at an angle apperas bent due to refraction of light ar the air water surface. Figure shows a straight pencil AO whose lower portion BO is immersed in water. it appears to be bent at point B in the direction BI. A ray of light OC coming from the lower end O passes from water into air at C and gets refracted away from the normal in the direction CX Another ray OD gets refracted in the direction DY. The two refracted ray CX and DY, when produced backward, appear to meet at point I, nearer to the water surface than O Similarly each part of the immersed portion of the pencil raides. As A result immersed portion of the pencil appears to be bent when viewed at an angle from outside.Alternate Answer
Incident rays from pecil travel form water to air, and they bend away from normal, To an observer image of the immersed part of the pencil forms at a different position and pencil appears to be bent.
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