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Home » 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 is 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 the 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.
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 is 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 the 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.
CBSE | Class 12 | NCERT Exemplar | Physics | Ray Optics and Optical Instruments
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 is 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 the 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:

(a) the apparent depth of the points close to the edge is 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 the air.

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

When light from a submerged object is refracted by the water surface before reaching the observer, the rays bend away from normal, and the angle subtended by the object’s image at the eye is smaller than the real angle subtended by the object in air. In addition, the apparent depth of the spots close to the edge is closer to the water’s surface than the points farther from the edge.
The angle of incident grows as we move to the right, eventually equaling the critical angle. As a result of 100% internal reflection, some of the object’s points far away from the edge may be obscured.

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