What focal length is necessary for the lens

Reference no: EM138409

Q1. An electron librated from a hot filament cathode is attracted by an anode with a potential of 1200V positive with respect to the filament. Compute the speed of the electron when it strikes anode?

Q2. In order to clearly read a book 23 cm away, a farsighted girl needs an image to be 34 cm from her eyes. What focal length is necessary for the lens in her eyeglasses?

Reference no: EM138409

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