Important Talent Search Exams
|Allen TALLENTEX 2018 (Class 5 to 11)|
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O is the object and is the image is the angle of deviation
Illustration 8: An object is 1 metre in front of the curved surface of a plano–convex lens whose flat surface is silvered. A real image is formed 120 cm in front of the lens. What is the focal length of the lens?
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