The left end of a long glass rod 8.00 cm in diameter, with an index of refraction 1.64, is ground and polished to a convex hemispherical surface with a radius of 4.00 cm . An object in the form of an arrow 1.49 mm tall, at right angles to the axis of the rod, is located on the axis 23.5 cm to the left of the vertex of the convex surface.
Required:
a. Find the position of the image of the arrow formed by paraxial rays incident on the convex surface.
b. Find the height of the image formed by paraxial rays incident on the convex surface.
c. Is the image erect or inverted?
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Ответ:
The anode needs to have a low electron affinity because it needs to readily release electrons, and the cathode needs to have a high electron affinity because it needs to readily accept electrons.