Q: A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. The focal length of lens is एक पतले उभयोत्तल लैन्स की प्रत्येक वक्रता त्रिज्या 40 सेमी तथा काँच का अपवर्तनांक 1.65 है। इसकी फोकस दूरी होगी-
A.
20 cm
B.
31 cm
C.
35 cm
D.
50 cm
Correct Answer:
Option B -
Explanations:
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