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If the focal length of the lens is 20 cm, find the distance of the image from the lens in the following figure? |
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Answer» Solution :According to figure, the point on the right side on the lens of which rays CONVERGE will behave as VIRTUAL object at the lens. `THEREFORE u=+12 cm,f=20 cm` By lens FORMULA,`1/f=1/v-1/u` `therefore 1/20=1/v-1/12` or `1/v=1/20+1/12=(3+5)/60=8/60` or `v=60/8`=7.5 cm so, image will be FORMED on same side of the virtual object at a distance of 7.5 cm from the lens. |
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