1. When an object is placed at the focus of a concave lens, its image is formed on the same side as the object. The image is virtual, erect, and highly diminished, appearing closer to the lens. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

    When an object is placed at the focus of a concave lens, its image is formed on the same side as the object. The image is virtual, erect, and highly diminished, appearing closer to the lens.

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

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  2. The refractive index of a transparent medium is the ratio of the speed of light in a vacuum (c) to the speed of light in the medium (v): n = c/v . It indicates optical density. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

    The refractive index of a transparent medium is the ratio of the speed of light in a vacuum (c) to the speed of light in the medium (v):
    n = c/v .
    It indicates optical density.

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

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  3. When an object is placed between f (focus) and 2f of a concave mirror: (i) The image formed is real. (ii) The image is magnified and inverted, forming beyond 2f. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

    When an object is placed between f (focus) and 2f of a concave mirror:
    (i) The image formed is real.
    (ii) The image is magnified and inverted, forming beyond 2f.

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

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  4. The velocity of light is minimum in medium A, as it has the smallest angle of refraction (15°), indicating the highest refractive index. Higher refractive index corresponds to lower light velocity in the medium. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapRead more

    The velocity of light is minimum in medium A, as it has the smallest angle of refraction (15°), indicating the highest refractive index. Higher refractive index corresponds to lower light velocity in the medium.

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

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  5. When light passes from a rarer to a denser medium, its wavelength decreases, but the frequency remains unchanged. The speed reduction in the denser medium causes a shorter wavelength while maintaining the same frequency. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/phyRead more

    When light passes from a rarer to a denser medium, its wavelength decreases, but the frequency remains unchanged. The speed reduction in the denser medium causes a shorter wavelength while maintaining the same frequency.

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-9/

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