InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters isA. `+1.5`B. `-1.5`C. `+6.67`D. `-6.67` |
|
Answer» Correct Answer - B `(1)/(F)=(1)/(f_(1)) +(1)/(f_(2)) = (1)/(40) +(1)/(-25)` `=(5-8)/(200) =- (3)/(200)` `P = (100)/(F(cm))D = (100)/(-200//3) =- 1.5D` |
|