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Q.

Which of the following things is/are necessary to see objects?


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a

Source of light

b

Object

c

Eye

d

All of the above 

answer is D.

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Detailed Solution

Source of light, object and eye are necessary to see objects.
When a light ray is an incident upon an object, it gets reflected back to our eyes, and an image is formed on the retina. An object is necessary to reflect a light ray incident upon it; a source of light is important as it incurs light rays, and the eye is useful to see the image formed clearly on the eye lens. Therefore all three; sources of light, objects and eyes are necessary to see objects.
 
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