Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Question 4
Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens.
Complete Figure 5 to show how an image of the visitor is formed by the... show full transcript
Worked Solution & Example Answer:Figure 5 is an incomplete ray diagram representing a visitor standing near the security lens - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Step 1
Complete Figure 5 to show how an image of the visitor is formed by the concave lens.
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Answer
To complete Figure 5, draw two correct rays from the top of the visitor:
A ray parallel to the principal axis that refracts through the focal point after passing through the lens.
A ray passing through the center of the lens that continues in a straight line.
The intersection of these refracted rays will form an image of the visitor. Draw an arrow from the image location indicating the direction of the image.
Step 2
How does the size of the image change?
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Answer
The size of the image decreases as the visitor moves further away from the security lens.
Step 3
Which material should the bolt be made from?
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Answer
The bolt should be made from Iron, as it possesses the necessary strength and magnetic properties for this application.
Step 4
Explain why the door unlocks when the switch is closed.
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Answer
When the switch is closed, an electric current flows through the solenoid. This creates a magnetic field, which magnetizes the solenoid. The magnetic field attracts the bolt, causing the door to unlock.
Step 5
Calculate the spring constant of the spring.
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Answer
To calculate the spring constant (k) of the spring, we can use Hooke's Law, which is given by the formula:
F=kimesx
where:
F = Force applied (2.88 N)
x = Extension of the spring (1.50 cm = 0.015 m)
Rearranging the formula gives:
k=xF=0.0152.88=192 N/m
Step 6
Give two ways the resultant force on the bolt could be increased.
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