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When light strikes a glass surface it can be both refracted and reflected - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1
Question 3
When light strikes a glass surface it can be both refracted and reflected. (a) The diagram shows the possible paths for a ray of light which strikes a surface at th... show full transcript
Worked Solution & Example Answer:When light strikes a glass surface it can be both refracted and reflected - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1
Step 1
Which of the lines shows the possible path of a ray of light passing from air into glass?
Answer
To determine which line represents the ray of light passing from air into glass, we note that light rays bend towards the normal when they enter a denser medium (in this case, glass) from a rarer medium (air). The correct answer is the line that represents this behavior, which is option B: POR.
Step 2
Which row of the table is correct for what happens when the wave is refracted?
Answer
When a wave travels from deep water to shallow water, its speed decreases and it changes direction towards the normal. Therefore, the correct answer is option D: speed changes and direction stays the same.
Step 3
Explain how a refracting telescope produces a magnified image of Jupiter.
Answer
A refracting telescope uses a combination of lenses to gather and bend light from an object, such as Jupiter. The objective lens collects light and brings it to a point called the focal point, forming a real image. This image is then viewed through an eyepiece lens, which magnifies the image further. Therefore, by using multiple lenses, the refracting telescope allows us to see a magnified view of celestial objects.
Step 4
Explain how Galileo’s observations contradicted the geocentric model.
Answer
Galileo's observations with the telescope revealed that Jupiter had moons orbiting it, which provided evidence that not all celestial bodies revolve around the Earth. Furthermore, he observed phases of Venus that could not be explained by the geocentric model. These observations supported the heliocentric model where planets, including Earth, orbit the Sun.
Step 5
Using this information, calculate the approximate distance of Jupiter from the Earth.
Answer
To find the distance from Jupiter to Earth, we can use the ratio of the time light takes to travel from the Sun to the Earth versus the time from the Sun to Jupiter. The calculations are as follows:
[ \frac{2100\text{ s}}{500\text{ s}} = 4.2 ] Using the distance from the Sun to Earth which is 150 million km, we multiply: [ 4.2 \times 150 = 630 \text{ million km} ] Thus, the approximate distance of Jupiter from the Earth is 630 million km.