A person is suffering from both near sightedness and far sightedness. His spectacles would be ma...

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A person is suffering from both near sightedness and far sightedness. His spectacles would be made of
[NTSE 2015]
a. Two convex lenses with the upper lens having a larger focal length than the lower lens.
b. Two concave lenses with the upper lens having a smaller focal length than the lower lens.
c. A concave lens as the upper lens and a convex lens as the lower lens.
d. A convex lens as the upper lens and a concave lens as the lower lens.
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