In Figure 15, the angle of incidence is labelled with the letter i - AQA - GCSE Physics - Question 5 - 2019 - Paper 1
Question 5
In Figure 15, the angle of incidence is labelled with the letter i.
Label the angle of refraction in Figure 15 with the letter r.
Measure the angle of incidence in... show full transcript
Worked Solution & Example Answer:In Figure 15, the angle of incidence is labelled with the letter i - AQA - GCSE Physics - Question 5 - 2019 - Paper 1
Step 1
Label the angle of refraction in Figure 15 with the letter r.
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Answer
The angle of refraction, denoted as r, should be clearly labelled in Figure 15 where the light ray exits the glass block into the air.
Step 2
Measure the angle of incidence in Figure 15.
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Answer
The angle of incidence can be measured using a protractor. In this case, the angle is found to be approximately 58°.
Step 3
Complete Figure 15 to show the path taken by the ray of light through the glass block and out into the air.
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Answer
The ray should continue in a straight line until it reaches the glass block. Upon entering the glass, it refracts away from the normal. After traveling through the glass, the ray exits into the air, continuing parallel to the incident ray.
Step 4
Calculate the value of X in Table 2.
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Answer
To find the value of X, we can use the average of the three measurements for the angle of refraction corresponding to an angle of incidence of 40°:
X = rac{23° + 27° + 25°}{3} = rac{75°}{3} = 25°.
Step 5
Complete the sentence.
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Answer
The student concluded that the angle of refraction is less than the angle of incidence used.
Step 6
Why is the student’s conclusion only valid for angles of incidence between 20° and 50°?
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Answer
The conclusion is only valid for angles of incidence between 20° and 50° because these angles are the only ones tested, and outside this range the relationship between the angle of incidence and angle of refraction may not hold true.
Step 7
Why did the student use a transparent block and not an opaque block?
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Answer
The student used a transparent block to allow the light to pass through, enabling the observation of refraction, which would not be possible with an opaque block.
Step 8
What must the student keep the same for both the plastic block and the glass block?
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The student must keep the angles of incidence tested the same for both the plastic block and the glass block to ensure a fair comparison of refraction.
