Why is there only a reflective ray here. .. Nevermind.. I think it is because it's like there is no object and only the example of the eye we saw previously. So it is a reflective ray only. Am I right?
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Physics
Answer (1)
Thank your for your question!
The goal of the swimming pool example is to find at what distance the observer has to be located to see both kids in the pool. The only rays that matter for this example are the rays that reflect off the extremities of the pool and bounce into the eye of the observer. This is why we only need to trace the reflected rays.
In the example with object S, we need to extend the reflected rays back to the image point. However, in order to know where the reflected rays are in the first place, one needs to draw the incident rays. Thus, a few more rays need to be drawn.
I hope this answers your question.
This webpage of the Alloprof website explains images formed by plane mirrors:
Alloprof aide aux devoirs | AlloprofGrâce à ses services d’accompagnement gratuits et stimulants, Alloprof engage les élèves et leurs parents dans la réussite éducative.
Don't hesitate if you need more help!
The goal of the swimming pool example is to find at what distance the observer has to be located to see both kids in the pool. The only rays that matter for this example are the rays that reflect off the extremities of the pool and bounce into the eye of the observer. This is why we only need to trace the reflected rays.
In the example with object S, we need to extend the reflected rays back to the image point. However, in order to know where the reflected rays are in the first place, one needs to draw the incident rays. Thus, a few more rays need to be drawn.
I hope this answers your question.
This webpage of the Alloprof website explains images formed by plane mirrors:
Alloprof aide aux devoirs | AlloprofGrâce à ses services d’accompagnement gratuits et stimulants, Alloprof engage les élèves et leurs parents dans la réussite éducative.
Don't hesitate if you need more help!