When a converging lens is used in a camera (as in the first drawing), the film must be placed at a distance of 0.150 m from the lens to record an image of an object that is 4.80 m from the lens. The same lens is then used in a projector (as in the second drawing), with the screen 0.430 m from the lens. How far from the projector lens should the film be placed? -Bulb Object Object (upside down) Projector Number i (b) - Film -Real image (inverted) Real image Units Screen <>

A Woman has a far point 3.5 m from hear eyes. If she is to see distance objects clearly what does the lens she required? A.Concave lens, its focal length = 0.29 m. Convex lens, its focal length = 0.29 m. Convex lens, its focal length = 3.50 m, D.Concave lens, its focal length = 3.50 m. B. C.

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If the focal lengths of both the objective lens and the eyepiece were doubled in a compound microscope, what would be the change in the magnification? Question 10 options:   It would increase by a factor of 4   It would increase by a factor of 2   There would be no change   It would decrease   None of the other responses are correct.