JEE Main 2013Session, Shift 1PhysicsMediumOptics190× since 2002Diameter of a plano-convex lens is 666 cmcmcm and thickness at the center is 3mm3mm3mm. If speed of light in material of lens is 2×108 m/s,2 \times {10^8}\,m/s,2×108m/s, the focal length of the lens isAOption A. 151515 cmcmcmBOption B. 202020 cmcmcmCOption C. 303030 cmcmcmDOption D. 101010 cmcmcmCheckSkip · show solution
