What can you see in a completely dark room? If you switch on an electric bulb in this dark room as a light source, explain how you could now see:(a) the electric bulb(b) a piece of white paper.

We cannot see anything in a completely dark room as there is no light present in the darkroom.

(a) After switching on an electric bulb in the dark room as a light source, we can see it as it emits light that reaches our eyes directly.

(b) After switching on an electric bulb in the dark room as a light source, we can see a piece of white paper due to the diffused reflection of light from the surface of the paper.

Image is posted for reference only.

We are able to see something because light from that object (sun, lamp) or the light reflected from the object (things around us which can't produce light) falls on our eyes. 

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Updated on: 10-Oct-2022

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