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Reciprocal length
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<p>Reciprocal length or inverse length is a <a href="/facts/Physical_quantity/S8pWBEpK">quantity</a> or <a href="/facts/Measurement/rsLLbn1s">measurement</a> used in several branches of <a href="/facts/Science/IJoaD7rs">science</a> and <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, defined as the <a href="/facts/Multiplicative_inverse/yczdYyCw">reciprocal</a> of <a href="/facts/Length/EwFyAqGH">length</a>. </p><p>Common units used for this measurement include the reciprocal metre or inverse metre (symbol: m−1), the reciprocal centimetre or inverse centimetre (symbol: cm−1). In <a href="/facts/Optics/p0vq4S1T">optics</a>, the <a href="/facts/Dioptre/as62tso3">dioptre</a> is a unit equivalent to reciprocal metre. </p>