An extended object is placed at a distance of 5.0 cm from a convex lens of focal length 8.0 cm . If a ray diagram is drawn to scale to locate the image, what is the distance of the image from the lens measured from this

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Correct answer: A. 13.3 cm

Given object distance, u = -5.0 cm Focal length of the convex lens, f = +8.0 cm Using the lens formula: (1)/(v) - (1)/(u) = (1)/(f) (1)/(v) = (1)/(f) + (1)/(u) (1)/(v) = (1)/(8.0) + (1)/(-5.0) (1)/(v) = (5 - 8)/(40) = -(3)/(40) v = -(40)/(3) -13.3 cm The negative sign indicates that a virtual image is formed on the same side as the object. The distance of the image from the lens is 13.3 cm .

An extended object is placed at a distance of 5.0 cm from a convex...

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