To see a non-luminous object, light from an source is required.

external

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internal

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infinite

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Solution

The correct option is A external
We see objects only when light from the object falls on our eye. For non luminous objects (like table, book etc) to be visible, there has to be an external source of light whose light falls on the object and then gets reflected back to our eyes.

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Similar questions

Non luminous object do not emit any light of their own. How is it still possible that we are able to see them

Choose the correct statements:

Statement 1: We see objects when light emitted from luminous objects enters our eyes.

Statement 2: We see objects when light reflected from the non-luminous objects enters our eyes.

Statement 3: Eyes alone cannot see an object.

Statement 4: Eyes emit light rays in all direction.

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