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Answer:
meter
Explanation:
A nearsighted person uses concave lens.
Given -
Far point i.e distance of object 
meter
Distance of image is not given . Hence we will assume that the image can be formed at any distance. We will take "di" 
infinity
As we know
Substituting the given values in above equation, we get -
Hence, the focal length of the contact lens is equal to meter
Answer:
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Explanation:
There are more than 3,000 species of snakes on the planet and they’re found everywhere except in Antarctica, Iceland, Ireland, Greenland, and New Zealand. About 600 species are venomous, and only about 200—seven percent—are able to kill or significantly wound a human. Snake vision varies greatly between species. Some have keen eyesight and others are only able to distinguish light from dark, but the important trend is that a snake's visual perception is adequate enough to track movements. A young snake that is still growing may shed its skin up to four times a year, but an older snake may shed only once or twice a year.Snake venoms are complex mixtures of proteins, and are stored in venom glands at the back of the head.[
Answer:
Scientists use the fossils around the new fossil to find its relative age.
Explanation:
