Question

A) An object sits in front of a converging lens 28.7 cm away from it. If the image of the object is formed 60.1 cm on the opposite side of the lens, what is the focal length of the lens?

B) One of the experimental data sets has a larger uncertainty than the others. What factors might have caused error in the measured value of the focal length? How could these factors have been avoided or minimized?

Answer 1

A )

given

An object sits in front of a converging lens 28.7 cm away from it.

the object is formed 60.1 cm on the opposite side of the lens

the focal length of the lens f = ?

using equation 1/ f = 1 / u + 1 / v

= 1 / 28.7 + 1 / 60.1

1 / f = 0.05148

f = 19.4242 cm

so the focal length of the lens is f = 19.4242 cm

B )

the factors might have caused error in the measured value of the focal length is

object distance

and

image distance

source what we used.

while calculating above distances need to take correct values.