Focal length: The lens power is the inverse of the focal length in meters. The physical unit for lens power is 1/meter which is called dioptre (D). Given: Focal length = 1 m Power = ? Power = 1/focal length (focal length = 1m) Power = 1D
56, 27, 14.5, 6.25, ?, 1.0625
78, 88, 100, 114, ?, 148
120, 157, 116, 159, ?, 165
7, 7, 21, 105, 735, ?
1, 7, 37, 187, 937, ?
306, 272, 240, ?, 182, 156
178 168 148 ? 78 28
64 32 32 48 96 ?
...What will come in place of the question mark (?) in the following series?
15, 16, 25, 50, 99, 180, ?
500, 250, 750, 375, 1125, 562.5, ?
