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X | PHYSICS | LIGHT L-7 | Why Focal Length of Mirrors taken Positive or Negative?
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why focal length of convex mirror is positive | why focal length of concave mirror is positive
why the focal length and radius of curvature of convex lens is positive ?#shorts #education
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focal length condition to be negative or positive
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why focal length of convex lens is positive and concave is negative answer this question
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