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129 महेश फोकल लेंथ ऑफ 10 सेंटीमीटर हुआ कैन वे अप्लाई साउथ साउथ एक्टर इमेज फोन स्मार्ट प्राइस |
| Answer» TION:POWER of lens = -2.0 DioptreLet the focal length of the lens be f.We KNOW that\begin{lgathered}Power \: of \: lens = \FRAC{1}{focal \: length} \\ \\ - 2.0 = \frac{1}{f} \\ \\ f = \frac{1}{ - 2}\end{lgathered} Poweroflens= focallength1 −2.0= f1 f= −21 f = -0.5 metreSince the focal length of the lens is negative. So, it is a concave lens. | |