# What is the distance between two lenses?

## What is the distance between two lenses?

The formula for the distance between the two lenses is simply the sum of the focal lengths of both the lenses. The focal lengths of both the lenses are given in the options.

### How do you calculate lens separation?

If the lenses of focal lengths f1 and f2are “thin”, the combined focal length f of the lenses is given by 1f=1f1+1f2 1 f = 1 f 1 + 1 f 2 while if the lenses are separated by some distance d then the combined focal length is given by 1f=1f1+1f2−df1f2 1 f = 1 f 1 + 1 f 2 − d f 1 f 2 .

**How is the distance between the lenses related to their focal lengths?**

In actuality, there are two focal points for every lens, the same distance from the lens, on opposite sides. The distance from the lens to the focal point is called the focal length. For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.

**What will be the formula for the combined focus distance of two lenses?**

I have found the formula for the effective focal length f of two thin lenses with focal lengths f1 and f2 separated by distance d to be 1f=1f1+1f2−df1f2.

## How do you find the distance between two lenses in a compound microscope?

For objective,

- v01−u01=f01.
- ∴v01−−21=1.51 or v0=6cm. For eye piece,
- ∴ve1−ue1=fe1;
- −251−ue1=6.251.
- −ue1=6.251+251 or. ue=−5cm. Distance between two lenses = ∣v0∣+∣ue∣ =6cm+5cm=11cm.

### When two lenses of focal length f1 and f2 are kept coaxially and separated by a distance d if f is the effective focal length?

f1=f1+f1.

**How do you use thin lens equation?**

Step 1: Find the focal length of the mirror (remembering that convex mirrors have negative focal lengths, by convention). Step 2: Find the image distance using the thin lens equation. Step 3: Use the magnification equation to relate the object distances and heights.

**What happens when the distance between an object and a lens increases?**

In a convex lens, if the size of the image obtained on a screen is decreasing on moving the object, then the object is moving in a path away from the lens. When an object is moved closer to the convex lens, the size of the picture formed on the screen increases. A convex lens is a lens with an outward curve.

## What is thin lens combination?

Compound lenses are the type of lenses that features two thin lenses that are mounted on a common axis usually closer to each other or often cemented together.

### What is combination of thin lens in contact?

Power of a lens is a measure of the degree of convergence or divergence of light falling on it. The power of a lens (P) is defined as the reciprocal of its focal length. The unit of power is dioptre (D) : 1 D = 1 m-1.

**What is the focal length of compound microscope?**

In compound microscope, the focal length of objective and eye-lenses are 1.2 cm and 3 cm respectively.