Question

A 7.5 cm tall Aragorn action figure is placed 12.4 cm in front of a double convex lens. If the image of Aragorn is located 7.5 from the lens, what is the focal length of the lens?

Answer 1

f = 4.67 cm

Step-by-step explanation:

Here, we can use the thin lens formula, as follows:

`(1)/(f)= (1)/(p)+ (1)/(q)\\\\`

where,

f = focal length of lens = ?

p = distance of object from lens = 12.4 cm

q = distance of image from lens = 7.5 cm

Therefore,

`(1)/(f) =(1)/(12.4\ cm) +(1)/(7.5\ cm)\\\\(1)/(f) = (1)/(4.67\ cm)`

f = 4.67 cm