Which of the following set of materials represents the minimum material requried for determing the focal length of a convex lens by obtianing the image of a distannt object on a screen in your school laboratory.
Set A- A candel, a match box, a convex lens, a lens holder, a screen with stand
Set B- A lens holder a convex lens, a concave lens, a measuring scale.
Set C- A convex lens holder, a scrren with a stand, a measuring scale.
Set D- A convex lens, a burning candle, a screen with stand, a lens holder

Options

A. Set A
B. Set B
C. Set c
D. Set D