Explanation:
Copper wire obeys Ohm's law (V ∝ I) at constant temperature. Diode, transistor are non-ohmic (non-linear). Electrolytes can be non-linear. Metals are ohmic.
Explanation:
Myopia (near-sightedness) occurs when the image is focused in front of the retina. It is corrected using a concave (diverging) lens. Hypermetropia (far-sightedness) is corrected with a convex (converging) lens. Astigmatism is corrected with a cylindrical lens. Presbyopia is usually corrected with bifocal lenses.
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