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प्रश्न
The point on the principal axis of a convex lens, such that rays start from it after refraction, travel parallel to principal axis is called ______ principal focus.
विकल्प
second
first
MCQ
रिक्त स्थान भरें
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उत्तर
The point on the principal axis of a convex lens, such that rays start from it after refraction, travel parallel to principal axis is called first principal focus.
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