In a lens laboratory investigation

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

In a lens laboratory investigation, students record the object distance

s_o

and image distance

s_i

for a single data trial. Which of the following expressions would correctly yield the focal length

f

from those two measured quantities? (a)

\dfrac{s_i s_o}{s_i+s_o}

(b)

\dfrac{s_i+s_o}{2}

(c)

\dfrac{1}{s_i}+\dfrac{1}{s_o}

(d)

\dfrac{s_i s_o}{s_o-s_i}