What is the focal length of the combination when both lenses are in contact?

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

Do converging lenses have the same focal length on both sides?

If both sides of the lens curve outward, it is called a converging lens, and it will bend light from distant objects inwards toward a single point, called the focal point. That means that the focal point is on the same side of the lens as the light rays were coming from.

What happens to the focal length of a converging lens when it is placed under water?

“Under water, the index of refraction is greater and closer to the index of refraction of the lens; this makes the angle of refraction smaller by Snell’s law so the focal length will increase.”

How two converging lenses should be arranged so that a parallel beam of light becomes parallel after passing through the combination of lense?

If the distance between two lenses becomes equal to sum of their focal lengths then the parallel beam of light will emerge parallel after passing through the second lens.

What is focal length of a converging lens?

For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.

What are the two converging lenses present in a telescope describe each lens?

The first lens is called the objective lens. This lens is a convex lens that bends the incoming light rays to a focal point within the telescope. The second lens is called the eyepiece.

When a converging lens is immersed in water does its focal length increase or decrease in comparison with the value in air explain?

When immersed in water, the difference between light’s speed in the lens and the surrounding medium is less than the difference when it’s in air, and the focal length of a lens would be greater under water.

Would the focal length of a lens change if the lens were to be submerged in some material for example if the lens was placed underwater?

Yes. Focal length changes when lens is immersed in water.

How two converging lenses should be arranged?

When the two lenses are arranged parallel such that the second focal length of the first lens coincides with the first focal length of the second lens, then the rays after refraction from the first lens meet at the focal point of the second lens.

How two converging lenses should be?

The distance between the lenses should be 50cm. The distance between the lenses should be 30cm.

Which is the converging lens?

A double convex lens, or converging lens, focuses the diverging, or blurred, light rays from a distant object by refracting (bending) the rays twice. This double bending causes the rays to converge at a focal point behind the lens so that a sharper image can be seen or photographed.

What is the purpose of the extra converging lens in the terrestrial telescope located between the objective lens and the eyepiece?

The Eye. By inserting an additional converging lens between objective and eyepiece the astronomical telescope may be adapted for viewing objects near at hand so that they appear erect.

What is the focal length of two lens system?

Two lens system – Image distance and magnification Home Problems and Answers Optics Two lens system – Image distance and magnification Two converging lenses, with the focal length f 1 = 10 cm and f 2 = 15 cm are placed 40 cm apart, as shown on the figure. An object is placed 60 cm in front of the first lens as show in second figure.

What is the distance between two converging lenses?

Two converging lenses, with the focal length f 1 = 10 cm and f 2 = 15 cm are placed 40 cm apart, as shown on the figure. An object is placed 60 cm in front of the first lens as show in second figure.

What is the magnification of first lens and second lens?

First lens has magnification of – 0.2, the image is inverted and is 0.2 times of original height. Lets apply image magnification equation to second lens m 2 = – 1.15 Second lens has magnification of – 1.15

How do you find the power of two lenses in contact?

When two lenses are placed in contact, the power of the combination is equal to the algebraic sum of the powers of the individual lenses. The power of each of the lenses of focal length f metres is 1 f dioptre. ⇒ The power of the combination of two converging lenses of the same focal ( f) is 2 f dioptre.