give reasons :
(a) : why is a normal eye not able to see clearly the objects placed closer than 25cm ?
(b) why is red colour selected of using fossil fuels
Answers
A normal eye cant see object closer than 25 cm because our lens and cilliary muscles cannot adjust the focal length to see object.
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A:-The least distance of distinct vision or the near point of the eye.
This is because the ciliary muscles of eyes are unable to contract beyond a certain limit. If the object is placed at a distance less than 25cm from the eye, then the object appears blurred because light rays coming from the object meet beyond the retina.
B:-Natural gas reserves are more evenly distributed around the globe than oil supplies. Energy gained from burning fossil fuels is converted to electricity and heat in commercial power plants. When fossil fuels are burned carbon and hydrogen react with oxygen in air to carbon dioxide (CO2) and water (H2O).