In a photoelectric effect experiment, a graph is plotted between the stopping potential (V0) on the y-axis and the frequency of incident light (v) on the x-axis. The slope of this straight line gives the value of:
A.Planck's constant divided by electron charge (h/e)
Explanation:
Einstein's photoelectric equation is K_max = hv - W. Since K_max = eV0 (where V0 is stopping potential), eV0 = hv - W. Rearranging for the y-axis variable gives V0 = (h/e)v - (W/e). This is a linear equation y = mx + c. The slope 'm' of the V0 vs v graph is strictly exactly h/e.
Explanation:
The eye lens is a convex (converging) lens. It converges light rays to form a real and inverted image on the retina. The brain processes this signal and flips it so we perceive the world as erect. All other statements are functionally correct. The cornea does indeed do about two-thirds of the focusing.
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