Separation between a small object and a screen is $$50cm$$. A convex lens is placed between the object and the screen in two different positions and a sharp image is formed on the screen in each case. If in one case distance of lens from the object is $$20cm$$. What will be the object distance for the other position of the lens?

Question

Infinity Learn · Accepted Answer

In the two positions of the lens, image distance and object distance are interchanged.Image distance for one case $$=$$ $$(50-20)cm$$ $$=$$ $$30cm$$∴Object distance for the other case $$=$$ $$30cm$$

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