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define focus

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define focus

    • Posted by Kumar Mayank 8 years, 4 months ago

    CBSE > Class 08 > Science
    • 3 answers

    Yuvraj Kumar Singh 8 years, 4 months ago

    Force may be define as an external cause which change or tend to change the state of rest or to uniform motion of a body in a straight line

    2Thank You

    Amar Kumar 8 years, 4 months ago

    Principal focus or focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection 

    Acentral point of attention or interest

    1Thank You

    Amar Kumar 8 years, 4 months ago

    A point at which rays of light, heat, or other radiation meet after being refracted or reflected or appearing to meet.

    0Thank You

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