An object of height 4 cm is placed at a distance of 30 cm from the optical centre 'O' of a convex lens of focal length 20cm . draw a ray diagram to find the position and size of the image formed. also find the approximate ratio of the size of the image to the size of the object.
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the size of the object is 4
the size of image will be 8
the image will form beyond 2f
the ratio will be2:1
the size of image will be 8
the image will form beyond 2f
the ratio will be2:1
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