Question

the power of combination of two lenses XY is 50 if the focal length lense X is 15cm,state the nature and focal length of lens Y ​

Answer 1

p=1/fx

px=1/0.15 [15 cm=0.15m]

px=6.67

p total=px+py

50 =6.67+py

→py=50-6.67

→py=43.33

py=1/fy

→fy=1/py

→fy=1/43.33

convex lens