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One can sense colours only in bright lig...

One can sense colours only in bright light.

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(i) The light sensitive screen of the eye called retina has two types of light sensitive cells.
(ii) Rod cells are concerned with intensity of light and cone cells are responsible for the vision in presence of light.
(iii) Cone cells are also concerned with colour perception. They do not respond to dim light or no light. Rod cell respond to faint light but conical cells do not.
(iv) Cone cells can function only in bright light.
(v) Hence, we can identify and differentiate colours in presence of light.
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