define focallenght of a divergent lens
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Focal length of a divergent lens, that is concave lens is the distance between principle focus and the optic centre. Where the principle focus is the point on principle axis from which the ray coming parallel to the principal axis appears to diverge after refraction.
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Focal length of a divergent lens
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Focal length of a diverging lens is the distance between center of the lens and the principal focus.
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Focal length of a diverging lens is the distance between center of the lens and the principal focus.
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