How far apart should two lenses be put in order to achieve the best results?

- Image distance and magnification are both controlled via a two-lens system. Problems and Solutions in the Home Optics Image distance and magnification are both controlled via a two-lens system. On the picture, two converging lenses, with focal lengths of f1 = 10 cm and f2 = 15 cm respectively, are set 40 cm apart and at different distances from one another. As seen in the second picture, an object is put 60 cm in front of the first lens.

Contents

- 1 What is the distance between the lenses?
- 2 What is the the distance between objective lens and eyepiece in astronomical telescope?
- 3 What is the distance between the objective and the eyepiece?
- 4 How do you find the focal length of a combined lens?
- 5 How do you find the focal length of two lenses?
- 6 Why does a telescope need two lenses?
- 7 What is the formula of lens formula?
- 8 What are the two lenses of telescope?
- 9 What is the difference between two lenses used in astronomical telescope?
- 10 What is the separation between the objective and eyepiece of an astronomical telescope when the final image is formed at infinity?
- 11 Why is the telescope adjusted for a distant object?
- 12 What is the purpose of the diaphragm located underneath the stage?

## What is the distance between the lenses?

The distance between the center of the lens and the focal point of the lens is referred to as the focal length of the lens once again. Remember that the focal length and power of a diverging lens are both defined as negative values in this case! Example: If the distance between two points on the axis of the lens is 5.00 cm, the focal length of the lens is f=–5.00 cm and the power of the lens is P=–20 D.

## What is the the distance between objective lens and eyepiece in astronomical telescope?

A telescope used for astronomy has a focal distance of d=36cm between the objective and the eyepiece, and the final picture is generated when the telescope is pointed towards infinity.

## What is the distance between the objective and the eyepiece?

Question: In a microscope, the distance between the objective and eyepiece lenses is 23 cm.

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

The combined focal length (F) is calculated as follows: =f 1 f 2 /[f 1 + f 2] +20 cm when F = 10x(-20)/[10-20] is used. It is a convex lens since the combination has a positive focal length due to the positive focal length. Experiment on the Focal Length of a Concave Lens. Using the following equation, we can calculate the combined focal length for two thin lenses separated by a distance a (Figure 2): 7.

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

Lenses that have been combined but are separated by a distance.

- Lenses that have been combined but are separated by a certain distance

## Why does a telescope need two lenses?

Refracting telescopes function by focusing light via two lenses, giving the impression that the item is closer to you than it actually is. Reflective mirrors of this design likewise achieve the purpose of bending light together, but they do it by reflecting the light rather of bending the light as it travels through them (like lenses do).

## What is the formula of lens formula?

What is the Lens Formula, and how does it work? To put it another way, according to the convex lens equation, the lens formula is 1/1f = 1/1v + 1/1u. It describes the relationship between the focal length of a lens and the distance between an item put in front of it and the picture created of that object.

## What are the two lenses of telescope?

They concentrate light and make distant things look brighter, clearer, and enlarged when used in conjunction with a magnifying glass. A refracting telescope is the name given to this type of telescope. The majority of refracting telescopes have two primary lenses. The objective lens is the larger of the two lenses, while the eyepiece lens is the smaller of the two lenses that is used for seeing.

## What is the difference between two lenses used in astronomical telescope?

There are two positive lenses used in the construction of an astronomical telescope: the objective, which, at its focal length, generates an image of a distant object, and the eyepiece, which serves as a basic magnifier for seeing the image generated by the objective.

## What is the separation between the objective and eyepiece of an astronomical telescope when the final image is formed at infinity?

The distance between the objective and the eye piece is 36 cms, and the final picture is generated at infinity while looking through the objective.

## Why is the telescope adjusted for a distant object?

It is necessary to adjust the telescope to receive parallel rays by pointing it toward a distant object and changing the distance between the objective lens and the eyepiece in order to obtain a clean image on the cross wire.

## What is the purpose of the diaphragm located underneath the stage?

Iris Diaphragm: Typically found beneath the stage of high power microscopes, the diaphragm is a five-hole disc with each hole having a varied diameter, as seen in the illustration. It is used to modify the contrast and resolution of a specimen by varying the amount of light that passes through the stage opening. It is also used to regulate the light that goes through the stage opening.