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10 (a) (i) Which lens is a converging lens with the greatest power? A B C D (ii) The equation that relates the power of a lens to the focal length of the lens is power (in dioptres) = 1 focal length (in metres) The power of a lens is 5 dioptres - Edexcel - GCSE Physics - Question 10 - 2019 - Paper 1
Question 10
10 (a) (i) Which lens is a converging lens with the greatest power? A B C D (ii) The equation that relates the power of a lens to the focal length of the lens is ... show full transcript
Worked Solution & Example Answer:10 (a) (i) Which lens is a converging lens with the greatest power? A B C D (ii) The equation that relates the power of a lens to the focal length of the lens is power (in dioptres) = 1 focal length (in metres) The power of a lens is 5 dioptres - Edexcel - GCSE Physics - Question 10 - 2019 - Paper 1
Step 1
Which lens is a converging lens with the greatest power?
Answer
To determine which lens is a converging lens with the greatest power, we need to identify the lens shape that allows parallel rays of light to converge at a focal point. Typically, a converging lens will be thicker in the middle compared to the edges. Based on the characteristics of converging lenses, Lens B appears to have the greatest curvature and thus would be the lens with the highest power.
Step 2
Use the equation to calculate the focal length of the lens in cm.
Answer
Given the power of the lens (P) is 5 dioptres, we can use the formula:
P = rac{1}{f}
where:
- P is the power in dioptres,
- f is the focal length in metres.
From this, we can rearrange the formula to find the focal length:
f = rac{1}{P}
Substituting the value of power:
f = rac{1}{5} = 0.2 ext{ metres}
To convert this into centimetres, we multiply by 100:
Thus, the focal length of the lens is 20 cm.