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Question no 1 A] How many electrons are necessary to produce 1.2 C of negative charge?...

Question no 1 A] How many electrons are necessary to produce 1.2 C of negative charge? (e 1.60 x 10-19 C) CI Roman is nearsighted and his far point is 150cm from his eyes. What should be the focal length of his eyeglass lens so that he can focus on a very distant object? (i) Draw a labelled ray diagram with the eyeglass lens. (i) Find the power of his lens. (Power- 1/(focal length (in meter) D] A compound microscope has an objective of focal length 0.8 cm and an eyepiece of focal length 1.25 cm. A red blood cell is located 0.84 cm in front of the objective lens (i.e., away from eyepiece), the image distance for the objective lens is 16.8 cm, the object distance for the eyepiece is 1.2 cm and the final image (i.e., image formed by eyepiece) of the cell is formed 30 cm from the eyepiece towards the objective lens. The viewer's near point is 0.25 m. i) Draw a labelled ray diagram (neat and clean also) and (i) Find angular magnification of the microscope

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