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Why focal length is always negative …

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Why focal length is always negative in concave mirror?

    • Posted by Adesh Chahar 7 years, 4 months ago

    CBSE > Class 12 > Physics
    • 4 answers

    Muskan Verma 7 years, 4 months ago

    Focal length is always negetive in concave mirror because reflection process takes place on smooth surface and its smooth surface lies on left side therefore all parameters like f n u are taken as negative

    0Thank You

    Abhineet Aanand 7 years, 4 months ago

    It's acc to sign convention

    0Thank You

    M. पी. Rai 7 years, 4 months ago

    Inconcave mirror always focal length is zero because it's image form left side

    0Thank You

    Manvi Dhariyal 7 years, 4 months ago

    Focal length is always positive for concave mirror. It is negative for convex mirror.

    0Thank You

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