define optical centre of a spherical lens .
a divergent lens had a focal length of 20cm at what distance should an object of height 4cm from the optical centre of the lens be placed so that it's image is formed 10 cm away from the lens find the size of the image also . draw a ray diagram to show the formation of image in the above situation .
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a) It is the central point of the lens through which a ray of light passes without suffering any deviation.
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