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प्रश्न
Define the focal length of a concave mirror.
परिभाषा
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उत्तर
The distance between the pole and the principal axis is known as the focal length of a concave mirror.
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 1: Reflection of Light - Exercise 2 [पृष्ठ २८]
