Answer:
distance between apple and the eye of the person, u = 60 cm
Given:
image distance, u' = 2.5 cm
focal length, f = 2.4 cm
Solution:
By using lens maker formula:
[tex]\frac{1}{f} = \frac{1}{u} + \frac{1}{u'}[/tex]
where
u = object distance
u' = image distance
f = focal length
Putting the respective values in the lens maker formula:
[tex]\frac{1}{2.4} = \frac{1}{u} + \frac{1}{2.5}[/tex]
[tex]\frac{1}{u} = \frac{1}{2.4} - \frac{1}{2.5}[/tex]
[tex]\frac{1}{u} = \frac{2.5 - 2.4}{2.4\times 2.5}[/tex]
[tex]\frac{1}{u} = 0.01667 [/tex]
u = 60 cm
