• INTRODUCTION [1 mark]
One of the properties of light is that it refracts when passing through different mediums, we will
be investigating this property of light with a thin lens.
• AIMS & OBJECTIVES [1 mark]
To determine the focal length of a converging lens using three different methods
• RESULTS & CALCULATIONS
➢ METHOD 1: Focal Length Estimate [1 mark]
𝑣 ± ∆𝑣
= 𝑓𝑒𝑠𝑡𝑖𝑚𝑎𝑡𝑒 ± ∆𝑓𝑒𝑠𝑡𝑖𝑚𝑎𝑡𝑒
f=11.5± 0.05
➢ METHOD 2: Object-Image Separation [6 marks]
MEASURED CALCULATED
Distance between Distance between
𝑑2 𝑑2
± Δ( )
Object distance for Object distance for
screen & light two lens positions
lens position 1 lens position 2 𝑠 𝑠
source
d ± Δd (cm)
u1 ± Δu1 (cm) u2 ± Δu2 (cm) (cm)
s ± Δs (cm)
50 ± 0.05 19.9±0.05 30±0.05 10.1±0.05 2.04±0.05
53 ± 0.05 18.4±0.05 34.6±0.05 16.2±0.05 4.95±0.05
56 ± 0.05 17.4±0.05 38.6±0.05 21.2±0.05 8.03±0.05
59 ± 0.05 16.8±0.05 43.2±0.05 26.4±0.05 11.81±0.05
62 ± 0.05 16.3±0.05 45.7±0.05 29.4±0.05 13.94±0.05
65 ± 0.05 15.9±0.05 49.1±0.05 33.2±0.05 16.96±0.05
Write Eq. (2), found on page 1 of the instruction manual, in a linear form:
𝑑2 𝑠
= −𝑓
4𝑠 4
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