(ii) With the laptop screen in the position shown in part a(i)George sees an image of the lamp on the screen. George tilts the screen forwards as shown below. When the screen is tilted forwards it is easier for George to see the words on the screen. What happens to the reflected ray of light when the screen is tilted? (b) George listens to music on his headphones. Complete the sentence below using words from the box chemical electrical gravitational potential sound thermal The useful energy change in the headphones is from energy into __ energy.

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(ii) With the laptop screen in the position shown in part a(i)George sees an image of the lamp on the screen. George tilts the screen forwards as shown below. When the screen is tilted forwards it is easier for George to see the words on the screen. What happens to the reflected ray of light when the screen is tilted? (b) George listens to music on his headphones. Complete the sentence below using words from the box chemical electrical gravitational potential sound thermal The useful energy change in the headphones is from energy into __ energy.

Answer 1

**(ii)**: When the laptop screen is tilted forwards, the reflected ray of light from the screen also changes direction following the law of reflection (\(\theta_{i}=\theta_{r}\)). **b(i):** The useful energy change in the headphones is from electrical energy (source energy) into sound energy (produced energy or useful energy), referencing the forms of energy provided.

Answer 2

## Step1: From the question, it is deduced that the headlights projection is reflected off the laptop screen onto George's eyes. Hence, when the screen is tilted forward as indicated, the angle of reflection also changes. This concept is regarded as the law of reflection - the angle of incidence equals the angle of reflection. ### Formula/Formulation: \(\boldsymbol{\theta_{i}=\theta_{r}}\), where - \(\theta_{i}\) is the angle of incidence and - \(\theta_{r}\) is the angle of reflection. ## Step2: When considering energy conversion in headphones, with regards to the provided mechanisms, the conversion is usually from electrical energy to sound energy. - An electrical signal (electrical energy) is processed or manipulated within a sound-producing technology such as speakers or headphones - This electrical energy conversion triggers a mechanical reaction in the internal components of the sound-producing device leading to the vibration of air, here been traversed, ultimately leading to distinguishable sound (the sound energy).

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