Question

The power of the lens is -2.5D,then it's focal length is_____
A)250cm
B)-40cm
C)-1250cm
D)80cm

Answer 1

HEY MATE HERE IS THE ANSWER TO THE QUESTION...✔️✔️

▶️THE FORMULA IS D= 1/f✔️

▶️f = 1/D✔️

▶️ f = 1/-2.5 = 1 * 10/25 = - 2/5 IS THE ANSWER. ✔️

➡️➡️HOPE YOU ARE DOING WELL.. ❤️❤️