Question

1) An object located 33.9 cm in front of a lens

forms an image on a screen 8.57 cm behind
the lens.
Find the focal length of the lens.
Answer in units of cm
2) What is the magnification of the object?

Answer 1

d= 33.9 cm
f= 857
F-?
G-?
The focal length of the lens:
F= d* / (d + f) = 33.9*8.57 / (33.9 + 8.57) = 6.84 cm
The magnification of the object:
M=f/d =8.57 / 33.9 ÷ 0.25

Answer 2

Step-by-step explanation:

Given:

d = 33.9 cm

f = 8.57

___________

F - ?

G - ?

The focal length of the lens:

F = d*f / (d + f) = 33.9*8.57 / (33.9 + 8.57) ≈ 6.84 cm

The magnification of the object:

M = f / d = 8.57 / 33.9 ≈ 0.25