list all the sign conventions for concave and convex lens
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Answer: about concave...Since, the centre of curvature and focus lie in front of the concave mirror, so signs of radius of curvature and focal length are taken as negative in the case of concave mirror.
In case of convex mirror ... It is opposite ...
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Explanation:
Concave- The kind of lens is used to correct myopia
Convex- Long - sightedness can be corrected by the use of a spectacles made from convex lenses
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