Question

An object is 2.0 cm from a double convex lens with a focal length of 1.5 cm. Calculate the image distance

Answer 1

Answer:

0.857 cm

Explanation:

We are given that:

The focal length for a convex lens to be (f) = 1.5cm

The object distance (u) = - 2.0 cm

We are to determine the image distance (v) = ??? cm

By applying the lens formula:

$\dfrac{1}{f} = \dfrac{1}{u}+\dfrac{1}{v}$

By rearrangement and making (v) the subject of the above formula:

$v = \dfrac{uf}{u-f}$

replacing the given values:

$v = \dfrac{(-2.0)(1.5)}{(-2.0 -1.5)}$

$v = \dfrac{-3.0}{(-3.5)}$

v = 0.857 cm