JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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If an electron enters into a space between the plates of a parallel plate capacitor at an angle

\alpha

with the plates and leaves at an angle

\beta

to the plates. The ratio of its kinetic energy while entering the capacitor to the while leaving will be

View answer and explanation

Correct option: B

\left(\frac{\cos \beta}{\cos \alpha}\right)^2

Option A (15 cm (Concave)) is correct because a concave lens with a focal length of 15 cm is required to correct the person's nearsightedness, allowing them to see objects clearly at 30 cm.

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