17. G) Define optical centre of a spherical lens.
(ii A divergent lens has a focal length of 20 cm. At what distance should an object of height 4 cm
from the optical centre of the lens be placed so that its image is formed 10 cm away from the
lens. Find the size of the image also
(iii) Draw a ray diagram to show the formation of image in above situation.
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20cm is object distance and 8cm is image height
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