if for a perfectly symmertical lens, r1=r2, then how will we find focal length??
Asked by Dark
| 5th Jan, 2022,
11:54: AM
Expert Answer:
We have Lens maker's formula
............................... (1)
where f is focal length , μ is refractive index of materilal of lens , r1 is radius of curvature of left side
spherical surface and r2 is radius of curvature of right side spherical surface.
numerically r1 = r2 = r, by sign convention r1 is positive and r2 is negative .
Hence we get from eqn.(1)
From the known value of radius of curvature and refractive index of material ,
we get focal length f from above expression
............................... (1)
Answered by Thiyagarajan K
| 5th Jan, 2022,
01:22: PM
Concept Videos
- Is convex always coverging or it depends on the conditions like refractive indices
- a person can see up to 1m the nature n power of which will enable him tosee things at 3m
- ifany body dare tell this sum answer and post it.
- Derive lens formula for concave lens and state lens formula.
- Derive lens formula for concave lens and state lens formula.
- An equiconex lens of power p is cut into two equal halves by a plane perpendicular to its principal axis . The power of its halves will be ?
- please solve the question in the picture.
- The refractive index of concave lens is 1.2. This lens is immersed in a liquid of refractive index 1.4. Explain the behavior of the lens.
- Suppose a lens has different radii of curvature, it forms an image of an object placed on its axis. If we reverse the lens will the position of the image of the object change?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change