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WebNCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction Questions Page: 168 1. Define the principal focus of a concave mirror. Answer-Light rays that are parallel to the principal axis of a concave … WebApr 5, 2024 · NCERT solutions Class 8 Science Chapter 13 will provide A detailed description of music and noise. Noise is Sound with endless structure. The music consists of sounds with fundamental overtones. Noise consists of sounds with frequencies that range continuously in value from as low as you'll hear to as high as you'll listen to - not … is babysitting considered volunteering

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