The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
A. moves fastest in air
B. is absorbed the most by smoke or fog
C. is scattered the least by smoke or fog
D. is scattered the most by smoke or fog
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The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called
A. Power of observation of the eye
B. Power of adjustment of the eye
C. Power of accommodation of the eye
D. Power of enabling of the eye
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