4 (a) (i) Figure 4 shows two light rays hitting a glass lens - Edexcel - GCSE Physics - Question 4 - 2020 - Paper 1
Question 4
4 (a) (i) Figure 4 shows two light rays hitting a glass lens. On Figure 4, draw the two light rays after they leave this lens.
Figure 4
(a) (ii) Figure 5 shows two... show full transcript
Worked Solution & Example Answer:4 (a) (i) Figure 4 shows two light rays hitting a glass lens - Edexcel - GCSE Physics - Question 4 - 2020 - Paper 1
Step 1
Draw the two light rays after they leave this lens.
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Answer
The rays diverging from the lens can be shown as arrows pointing away from the lens. The rays should reflect the divergence that occurs as they pass through the lens.
Step 2
Draw the two light rays after they leave this lens.
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Answer
The rays converging after passing through the lens can be shown as arrows converging towards a point, indicating where they focus after passing through.
Step 3
Calculate the power of the lens.
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Answer
To calculate the power of the lens, we use the formula:
ext{Power} = rac{1}{ ext{focal length in metres}}
Given that the focal length is 25 cm, we convert it to metres:
25extcm=0.25extm
Substituting this into the formula gives:
ext{Power} = rac{1}{0.25} = 4 ext{ dioptres}
Step 4
Determine the time when P and Q were at the same temperature.
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Answer
From the graph in Figure 7, identify the point where the lines for P and Q intersect. This occurs at approximately 11 minutes, which is when both balls were at the same temperature.
