How To Draw Ray Diagrams For Converging Lenses
Method for cartoon ray diagrams – convex lens
A convex lens ray diagram is a simple way of visualising the path that light rays accept when passing through a convex lens.
To draw a ray diagram and find the location of the image that would be created on a screen you only need to draw two ray lines. This is sometimes referred to as "The two rules of refraction for converging lenses". The but thing to remember is:
From the object
1. Laissez passer a parallel line through the principal focal point
ii. Pass a ray line through the heart of the convex lens
Here is each stage
1. From the object, pass a parallel line through the main focal point. We unremarkably choose the summit of the object:
ii. From the object, laissez passer a ray line through the middle of the convex lens.
Where these ii lines intersect is the top of the paradigm. Draw a line vertically up to the principal axis and you have your complete epitome as beneath:
And that is it. It's that easy.
We could stop the lesson at that place but Mammoth Memory but want to show y'all that y'all could in fact apply the same idea at any point on the object and the same ray diagram would work.
Let's endeavour a ray diagram from the centre of the object.
Y'all can encounter we could carry out this ray diagram method anywhere on the object, but again nosotros emphasise that this is unremarkably carried out from the tiptop of the object.
Notation: Some books inform you that there is one more rule for drawing ray diagrams and that is: from the object describe a line so that it passes through the object'due south side'southward master focal point on the way to the lens. This ray line will then refract and will travel parallel to the principal axis.
The in a higher place is useful to know but not necessary in order to work out the image position. Only the get-go two rules are needed.
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Source: https://mammothmemory.net/physics/lenses/convex-lenses/method-for-drawing-ray-diagrams-convex-lens.html
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