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प्रश्न
Define the focal length of a concave mirror.
व्याख्या
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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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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Reflection of Light - Exercise 2 [पृष्ठ २८]
