jtbell said:Calculate it both ways: using R1 for the convex side and R2 for the plane side; and using R1 for the plane side and R2 for the convex side. Does it make a difference in the result?
Hint: watch out for the + and - signs!
The focal length of a plano convex lens is the distance between the lens and the point where parallel rays of light converge to a single point after passing through the lens.
The focal length of a plano convex lens can be determined by measuring the distance from the lens to the point where the image of a distant object appears sharp and in focus. This is known as the focal point.
The focal length of a plano convex lens is affected by the curvature of the lens, the refractive index of the material it is made of, and the thickness of the lens. A thicker lens will have a shorter focal length, while a thinner lens will have a longer focal length.
A positive focal length means that the lens converges light rays and forms a real image, while a negative focal length means that the lens diverges light rays and forms a virtual image.
Yes, the focal length of a plano convex lens can be changed by changing the curvature of the lens, the refractive index of the material, or the thickness of the lens. This can be done by grinding or molding the lens to the desired shape.