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 that while leaving will be
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 that while leaving will be
- A
${\left( {\cos \,\alpha /\cos \,\beta } \right)^2}$
- B
${\left( {\cos \,\beta /\cos \,\alpha } \right)^2}$
- C
${\left( {\sin \,\alpha /\sin \,\beta } \right)^2}$
- D
${\left( {\sin \,\beta /\sin \,\alpha } \right)^2}$
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