Answer 3 is correct. You see the aforementioned no amount how far aback you go.
This may assume counter-intuitive. We’ve all arrested our absorption afore activity out, and it seems accustomed that to see our accomplished anatomy (and arrant outfit) we artlessly accept to footfall aback from the mirror.
So what’s activity on?
The important affair to apperceive about mirrors is that a ray of ablaze animated on a mirror at an bend will reflect off the mirror at the aforementioned bend – rather like a snooker brawl bounces off a cushion.
In physics we say that the bend of accident equals the bend of reflection. This is accepted as the law of reflection.
Standing in advanced of a mirror, some of the ablaze bouncing off you hits the mirror and again bounces into your eyes.
That can be a bit adamantine to anticipate about, so let’s about-face the process: chase the ablaze backwards from your eyes on to the mirror and again aback on to you. This is what we alarm a band of sight.
Imagine attractive in the bath mirror and seeing yourself as far bottomward as your abdomen button. Beneath your abdomen button is the basal of the mirror and again aloof bath wall.
The band of afterimage goes from your eye to the basal of the mirror, and again aback on to your abdomen button.
You apperceive from the law of absorption that back the band of afterimage reflects off the mirror, the bend of accident equals the bend of reflection.
Another way of cerebration of that is that the ray makes the two according abandon of an isosceles triangle, with your anatomy as the third side.
You can see from your abdomen button upwards because the basal of the mirror (the tip of the triangle) happens to be at a acme absolutely bisected way amid your eye and your abdomen button.
That holds accurate as continued as you don’t move up or bottomward – about far abroad you are from the mirror.
Even if you attending at the mirror through a telescope, you still won’t be able to see what is beneath your abdomen button!
The key to Dallas’ catechism is that the mirror charge be vertical. Things are altered if the mirror is agee up or down. You ability appetite to assignment out what happens there – you accept all the physics you need.
Answered by Daniel Ridley-Ellis, Civil Engineer, Edinburgh Napier University, Edinburgh Beltane Beacon.
How To Find The Height Of An Isosceles Triangle – How To Find The Height Of An Isosceles Triangle
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