Question

u – object distance

v – image distance

f – focal length

R – radius of curvature

Choose the option which shows correct sign convention.

• A. v = -ve, u = -ve, f = +ve, R = +ve,
  h = +ve, h' = -ve
• B. v = -ve, u = -ve, f = -ve, R = +ve,
  h = +ve, h' = -ve
• C. v = - ve, u = - ve, f = - ve, R = - ve,
  h = + ve, h' = - ve
• D. v = + ve, u = + ve, f = + ve, R = + ve, h = + ve, h’ = – ve

Answer 1

The correct option is C v = - ve, u = - ve, f = - ve, R = - ve,

h = + ve, h' = - ve

Therefore,

• u = – ve
• v = – ve
• h’ = – ve
• h = + ve
• R = – ve
• t = – ve