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प्रश्न
In the figure given below L is a convex lens, M is a plane mirror and S is a point source of light. Rays of light from the source S return to their point of origin. Complete the ray diagram to show this. What is the point S called?
आकृती
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उत्तर
The complete ray diagram is shown below:
The point S is called the focus of the lens.
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