# What is the formula of combination of lenses?

## What is the formula of combination of lenses?

Combination of thin lenses in contact The lens A produces an image at I1 and this image acts as the object for the second lens B. The final image is produced at I as shown in figure. PI1=v1, image distance for the first lens (A) and also object distance for second lens (B).

**What is P and Q in lens formula?**

Note the distance from the source to lens (call it p) and the distance from the screen to the lens (call it q). The light source has arrows drawn on it, one should be pointing up.

### How do you calculate combined lens power?

Solution : If powers of two lenses are `P_(1) and P_(2)` then the power of their combination is given by the formula `P = P_(1) + P_(2)`.

**What happens when two lenses are combined?**

Combination of lenses. When two lenses are used in combination, the first one forms an image that then serves as the object for the second lens. The magnification of the combination is the ratio of the height of the final image to the height of the object.

## What is the formula of combined focal length?

A Focal System When the distance of separation between the two lenses (d) is equal to the sum of the individual focal lengths (f1 + f2), the combined focal length is infinite. This makes the refracted light rays parallel to each other.

**What is the formula for focal length of combination of two lenses?**

When two or more thin lenses are placed in contact with each other, the power of the equivalent lens is the sum of the powers of the individual lenses. So, the focal length of the combination = 1/0.25 = 4m. Let’s discuss the concepts related to Physics and Optics. Explore more from General Science here.

### What is P in physics lens?

where p is the distance from the object to the lens, q is the distance from the lens to the. image and f is the distance from the lens to the principal focus (sign conventions as in the. reference), and. M = S.

**What is combination of power of lens?**

P=p1+p2. Thus the power of the combination of lenses is the algebraic sum of the powers of individual lenses. If two lenses are separated by a distance d metre, then the power of the combination of lenses is given by a relation.

## How do you find the combined focal length of two lenses?

Combined focal length of two thin lenses in contact is given by:

- 1/F = 1/f1 + 1/f2 Combined focal length (F): =f1f2/[f1 + f2]
- 1/F = 1/f1 + 1/f2 – a/f1f2

**What do you mean by combined focal length?**

Solution : The reciprocal of combined focal length is equal to the sum of the reciprocals of focal lengths of number of all lenses placed together.

### What is the focal length of combination of two convex lens?

The focal length of the combination of two convex lens in contact is f and if they are separated by a distance, then focal length of the combination is f1.

**What is the focal length of the combination of convex lens?**

According to the question – As a result, the focal length of the lens combination is 60cm. In addition, the negative sign indicates that the lens system in use is a diverging lens.

## What is P and Q in optics?

**What is 1 U 1 V 1 f?**

1v – 1u= 1f , according to the convex lens equation. It is the relationship between a lens’ focal length and the distance between an object in front of it and the picture created by that object.

### What is Class 10 combination lens?

A combination of Lenses is used in telescopes and microscopes to combine two or more lenses to: Obtain an object’s erect image.

**How do you find the focal length of a combined lens?**

Expert Answer:

- Power of concave lens = 100/20 = 5 D.
- Power of convexs lens = -100/30 D.
- Power of combined lens = (100/20) – (100/30) D = 100/60 D.
- focal length of combined lens = 60 cm.