Physics, asked by DevN, 1 year ago

Two lenses of power 3D and -5D are placed in contact to form a composite lens. An object is placed at 50cm from this combination. Find the position of the image.

Answers

Answered by Cathenna
5

 p1 = 3d \\ p2 =  - 5d\\  \\ net \: focal \: length =  \frac{1}{p1}  +  \frac{1}{p2} \\ f =  \frac{1}{3}   -  \frac{1}{5}  \\ f =  \frac{5 - 3}{15} \\ f =  \frac{2}{15}  \\  \\ object \: distance(u) =  - 50cm =  -  \frac{1}{2} m \\ focal \: length(f) =  \frac{2}{15} m \\ image \: distance(v) = to \: find \\  \\ mirror \: formula -  -  >  \frac{1}{f}  =  \frac{1}{v}  -  \frac{1}{u}  \\  \\  \frac{15}{2}   -   2 =  \frac{1}{v}  \\   \frac{15- 4}{2}  =  \frac{1}{v}  \\  \frac{1}{v}  =  \frac{11}{2}  \\ v = 0.1818m \\  \\ image \: distance = 18.18cm
Similar questions