Question 33
Lenses and Optical InstrumentsThe correct shape of the graph of uv against (u + v) for an object distance u and image distance v in an experiment to find the focal length of a convex lens is given as
- A.Graph A
- B.Graph B
- C.Graph C
- D.Graph D
Show the answer and explanation
Answer: A (Graph A)
Explanation
From 1/f = 1/u + 1/v, uv = f(u + v). So uv against (u + v) is a straight line through the origin with slope f, which is graph A.