Infinite-distance object lens depiction

  • Thread starter Thread starter Yipyioh
  • Start date Start date
  • Tags Tags
    Lens
AI Thread Summary
The discussion focuses on creating construction rays for an object at infinity refracting through a thin converging lens, with the image forming at the focal point. Participants suggest that the rays can be represented as parallel lines, originating from a distant light source like the sun. The concept of "converging at infinity" is emphasized, indicating that the rays should be drawn parallel to each other. There is confusion regarding the lack of reference to infinite objects in textbooks, but the parallel ray approach is confirmed as correct. Understanding this method is essential for accurately depicting the lens behavior in optics.
Yipyioh
Messages
1
Reaction score
0
This is rather simple but has me stumped. The assignment prompts me to create the construction rays of an object at infinity, refracting through a thin converging lens, with image focusing at focal point f. So where do the rays originate from?


My guess was perhaps it means just a light source like the sun focusing at the focal point f, but it still confuses me. There is no mention of an object at infinite range in my textbook, so how should I go about this?
 
Physics news on Phys.org
Welcome to PF!

Yipyioh! Welcome to PF! :smile:
Yipyioh said:
My guess was perhaps it means just a light source like the sun focusing at the focal point f, but it still confuses me. There is no mention of an object at infinite range in my textbook, so how should I go about this?

yes, like the sun …

and draw the lines parallel (because they "converge at infinity" :wink:)​
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...

Similar threads

Back
Top