Effective focal length of two plano convex

AI Thread Summary
The discussion centers on calculating the effective focal length of a system composed of two plano-convex lenses, both with a focal length of 30mm and a radius of curvature of 15.45mm. The lenses are positioned such that their curves collide along the propagation axis, and they share the same thickness of 3.16mm. Participants are encouraged to share their attempts at solving the problem to receive targeted assistance. The thread emphasizes collaboration and problem-solving in optics. Clear guidance is sought to progress in the calculation.
delgado
Messages
1
Reaction score
0

Homework Statement



Hello
Two plano convex with f1=f2=30mm and R1=15.45mm and R2=-R1. The two plano convex have the same thickness too (3.16 mm) and their curves colide in the propagation axis.
I believe you understand what i mean
What is the focal length of the two plano convex system?

Thanks in advance


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
Hi delgado! Welcome to PF! :smile:

(try using the X2 tag just above the Reply box :wink:)

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 

Thread 'Errors and significant figures'

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...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

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...
View full post »

Similar threads

Deriving back focal length using Fermat's principle
Replies
1
Views
2K
Image with an Plano-Convex lens
Replies
7
Views
3K
Understanding Two Convex Lenses: Ray Diagram and Focal Lengths
Replies
3
Views
2K
Calculating Chromatic Aberration
Replies
2
Views
1K
Image position in an optical system?
Replies
5
Views
2K
How Do Sign Conventions Affect Focal Length Calculations?
Replies
8
Views
2K
Convex Lens Problem: Find Focal Length
Replies
1
Views
1K
Lens-Makers Equation: Finding Focal Length in Different Mediums
Replies
2
Views
3K
Focal Length of a Plano-convex Lens
Replies
2
Views
8K
Focal length of a convex mirror
Replies
9
Views
3K

Hot Threads

Recent Insights

Back
Top