Really? Because ...fluidistic said:
... this looks like an equation to me
Pretty much correct. R2 is considered negative, so -1/R2 would be +1/(20cm).
Not quite. You went from 1/f = 1/20 (←correct) to f = 5
I'm not given any tip about what equation to use, therefore I thought I might confuse someone willing to help me if I put a wrong equation in the "relevant equations". But from now on, I must use this section as an attempt to relevant equations.Redbelly98 said:Hi,
Your method is mostly correct, but you have made some arithmetic errors.
Really? Because ...... this looks like an equation to me
Pretty much correct. R2 is considered negative, so -1/R2 would be +1/(20cm).
Not quite. You went from 1/f = 1/20 (←correct) to f = 5
Try that last bit of algebra again, you are very close.
RB
You're absolutely correct. For some reason, I read the question as saying "plano-convex". My mistake.fluidistic said:
It's -20, you were correct about it being negative. Of course, there should be units included when you report the answer.
Redbelly98 said:
Redbelly98 said:
A plano-concave thin lens is a type of lens that has one flat side and one curved side that is concave, meaning it curves inward like a bowl. This type of lens is often used to correct nearsightedness, as it diverges light rays and helps to focus them properly on the retina.
To check your result when using a plano-concave thin lens, you can use the thin lens equation: 1/f = 1/do + 1/di, where f is the focal length of the lens, do is the distance from the object to the lens, and di is the distance from the lens to the image. You can also use a ray diagram to visualize how the light rays are being refracted by the lens.
The accuracy of your result when using a plano-concave thin lens can be affected by several factors, including the curvature of the lens, the refractive index of the material the lens is made of, and the accuracy of your measurements for the distances do and di.
Yes, a plano-concave thin lens can be used for other purposes, such as in telescopes and microscopes. When used in these instruments, the lens helps to magnify the image by diverging the light rays and making them appear larger.
The power of a plano-concave thin lens can be determined by calculating the reciprocal of its focal length, which is measured in meters. For example, a lens with a focal length of 0.5 meters would have a power of 1/0.5 = 2 diopters. The higher the power, the more the lens will diverge light rays.