# What is D in thin lens formula?

## What is D in thin lens formula?

where do (the object distance) and di (the image distance) are both measured from the lens, and f is the focal length.

## How do you find the focal length of a thin lens?

The focal length of a thin lens is related to the radii of curvature of its two surfaces. 1/f = (n2 – n1)(1/R1 – 1/R2). Ri is positive, if xo and the center curvature are on the opposite sides of the respective surface. Ri is negative, if xo and the center curvature are on the same side of the respective surface.

**When can you use the thin lens equation?**

Either form can be used with positive or negative lenses and predicts the formation of both real and virtual images. It is valid only for paraxial rays (rays close to the optic axis) and does not apply to thick lenses.

**Which lens has more power thick or thin?**

A thick convex lens has more power than a thin convex lens because it has greater curvature or lesser focal length than a thin lens. Hence, the lens with a shorter focal length will have more power or higher refraction (causes more bending of light rays).

### What is V and U in Lens formula?

where u is the distance of the object from the lens; v is the distance of the image from the lens and f is the focal length, i.e., the distance of the focus from the lens.

### How thick is a thin lens?

For a thin lens, [the thickness] is much smaller than one of the radii of curvature. Here you have thickness 5 mm and radii of 10 mm.

**Does a thin lens have more power?**

A thick convex lens has more power than a thin convex lens because it has greater curvature or lesser focal length than a thin lens. A thick convex lens has greater curvature or lesser focal length, whereas a thin convex lens has lesser curvature or greater focal length.

**Is concave lens thick or thin?**

Difference Between Convex and Concave Lenses

Convex Lens | Concave Lens |
---|---|

A convex lens is thicker at the centre and thinner at the edges. | A concave lens is thicker at the edges and thinner at the centre. |

Due to the converging rays, it is called a converging lens. | Due to the diverging rays, it is called a diverging lens. |

#### How are O, I and f related in thin lens equation?

The Thin Lens Equation. These three quantities o, i, and f are related by the thin lens equation. (9.3.3.1) 1 o + 1 i = 1 f. Looking at our previous ray tracings it is apparent that the image and the object do not have to be the same size. This leads us to define the magnification m.

#### How to predict what a thin lens will do?

To predict exactly what a lens will do, we can use the thin lens equation: (1/do) + (1/di) = 1/f. In this equation, do is the object distance or the distance of the object from the center of the lens. Di is the image distance or the distance to the image that the lens produces from the center of the lens.

**How to solve Sal’s equation for thin lens?**

Using Sal’s equation in an earlier video, we have that (do/di) = (ho/hi). In a hypothetical example, let’s assume the height of the original image is 8 cm. Using the rest of the values from the video, we get (24/-6) = (8/x). Solving for x yields -2, which means that the image is inverted.

**Which is the magnitude of the thin lens?**

The magnitude of i is the distance between the lens and the image, but i can be either positive or negative. Here, we choose a convention where i > 0 f or a real image, and i < 0 fo r a virtual image.