Q. 125.0( 1 Vote )

Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because
A. the apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.

B. the angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.

C. some of the points of the object far away from the edge may not be visible because of total internal reflection.

D. water in a trough acts as a lens and magnifies the object.

Answer :

The light coming from the object is refracted at the water-air interface. This causes its apparent depth to be reduced. The apparent depth is less for objects father away from the edge. The refracted rays subtend a smaller angle in our eyes than the original rays would. Also, incident light from parts of the object far away from the edge may always strike the surface with angle greater than the critical angle. Hence, total internal reflection will occur, and light will not be refracted. Consequently, some parts might not be visible. Hence, the first three options are correct. Water doesn’t act like a lens. It is just a medium. Hence, (d) is incorrect.

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