Physics – 3.2.3 Thin lenses | e-Consult
3.2.3 Thin lenses (1 questions)
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We can use the lens formula to determine the image distance (v):
1/f = 1/u + 1/v
Where:
- f = focal length = 10 cm
- u = object distance = 15 cm
- v = image distance (what we need to find)
Substituting the values:
1/10 = 1/15 + 1/v
1/v = 1/10 - 1/15
1/v = (3 - 2) / 30
1/v = 1/30
v = 30 cm
The magnification (m) is given by:
m = v/u
m = 30 cm / 15 cm = 2
Therefore, the magnification of the image formed is 2. This means the image is twice the size of the insect.