Understanding Optical Power in Simple Lens Equations

  • Thread starter Thread starter rambo5330
  • Start date Start date
  • Tags Tags
    Optics
AI Thread Summary
Optical power is defined as the reciprocal of the focal length (P = 1/f). In the given problem, with a focal length of 6.7 m-1, the optical power is indeed 6.7. Therefore, the equation 1/p + 1/q should equal the optical power, confirming that 1/p + 1/q = 6.7 is correct. This means the initial assumption about the equation is valid. Understanding these relationships is crucial for solving lens equations effectively.
rambo5330
Messages
83
Reaction score
0

Homework Statement


I am given a question with the focal length stated in optical power
i.e 6.7m-1

what is optical power it is stated that it is = to 1/f

so in the equation 1/p + 1/q = 1/f
is it right to assume that 1/p + 1/q = 6.7
or is it 1/6.7
??

Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
Yes, optical power is defined as 1/f for the lens.
Your first assumption is correct.
1/p + 1/q = power of lens
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Calculating Chromatic Aberration
Replies
2
Views
1K
Optics problem with a glass lens immersed in water
Replies
3
Views
780
Inserting thick lenses into a thin lens system and deducing values
Replies
1
Views
2K
What is the focal point of a lens in a geometrical optics problem?
Replies
4
Views
1K
Calculate the focal length of the spectacle lens
Replies
3
Views
3K
Simple Optics Problem (plane mirror and lens)
Replies
5
Views
3K
Focal length of the eyepiece lens in a compound microscope
Replies
7
Views
1K
Optics Problem with a Double Lens System
Replies
1
Views
2K
Are Real Images Always Inverted and Virtual Always Erect in Ray Optics?
Replies
9
Views
8K
Lens Maker's Formula - Confusion in the derivation
Replies
15
Views
1K

Hot Threads

Recent Insights

Back
Top