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## A real image is formed by a convex lens. If we put a concave lens in contact with it,

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## Do concave lenses form a real image of the virtual object?

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Under the proper conditions, the concave lens will form a real image of the virtual object! A student conducting a laboratory project on concave lenses makes the following observations: when a lamp is placed 42.0 cm to the left of a particular convex lens, a real (inverted) image is formed 37.5 cm to the right of the lens.

**Concave lenses create only virtual images**. After the rays are refracted, they never converge and so there will be no real images. All concave lens images will be upright, virtual, and diminished, and can be found between the F and the lens.

How do you find the virtual object of a concave lens?

A concave lens produces a virtual image and hence the image of this object would be virtual. Now place a convex lens (second lens) behind the first lens. The virtual image of the first lens is the object of the second lens. ⇒ The second lens has a virtual object.

What type of image does a concave lens produce?

A concave lens produces a virtual image and hence the image of this object would be virtual. Now place a convex lens (second lens) behind the first lens.

What is virtual image formation in convex lens?

Image Formation in Concave Lens An object placed at infinity forms a virtual image at the focus. The size of the image is much smaller than that of the object. An object placed at a finite distance from the lens forms a virtual image between the pole and the focus of the convex lens.

Which virtual image is the object of the second lens?

The virtual image of the first lens is the object of the second lens. ⇒ The second lens has a virtual object.

## Why is it difficult to measure the focal length of concave lenses?

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Because a concave lens cannot form a real image of a real object, it is difficult to measure its focal length precisely. One method uses a second, convex, lens to produce a virtual object for the concave lens. Under the proper conditions, the concave lens will form a real image of the virtual object!

**The nature of the image formation in the concave lens is virtual and diminished. Now, we know that the image formation is diminished**so it becomes difficult to find its focal length. That’s why we are performing an experiment to find the focal length of a concave lens using a convex lens.

Is the focal length of a concave lens always positive?

Means the focal length of convex is always positive no matter whether it is mirror or lens. The focal length of convex mirror and lens is always +. For concave it is just the opposite of convex. So, the focal length of concave mirror and lens is always -. And focal length of Concave always negative. What does a positive focal length mean?

How to measure the focal length of a plano concave lens?

Measure the focal length of a plano concave lens by the self-collimation method (1) Place the slit light source plane mirror on the optical bench, and make the distance between them larger than the focal length of the measured concave lens. Place the concave lens to be measured between the object screen and the plane mirror.

What is focal length of a lens?

The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. Focal length can be positive or negative.

How do you find the focal length of a concave mirror?

For a concave mirror, the principal focus is in the front and for a convex mirror, the principal focus is at the behind. Below is an experiment to determine the focal length of a concave mirror and convex lens. To determine the focal length of: Convex lens by obtaining the image of a distant object.

## How does a convex lens magnify an object?

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An object placed at a finite distance from the lens forms a virtual image between the pole and the focus of the convex lens. As a result, the size of the image is smaller than that of the object. Concave lenses are used in telescopes and binoculars to magnify objects.

**light rays enter the convex lens present in the magnifying glass, these rays become focused on a specific focal point in front of the center of the lens**. Furthermore, if the magnifying glass is at an optimal distance, this generates the maximum magnification of the object.

What is the difference between convex and convex lenses?

Convex Lens. A convex lens is thicker at the centre than at the edges. Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge).

Why do convex lenses refract light?

The curved surface of the lens results in the refraction of light rays at different degrees. The outermost ray will refract the most. Another name of a convex lens is a converging lens or positive lens that is thicker in the middle.

How do lenses magnify light?

How lenses magnify. In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. It makes it appear to have come from a much bigger object.

Does a concave lens create magnification?

So if there was an image sensor, then wouldn’t the diverging light from a concave lens would cover more area on the image sensor than the converging light of the convex lens and thus create magnification? In physics magnification is a well defined quantity. It is size of image/size of object.

## What is the formula for concave lens?

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Concave Lens Formula. The lens formula is used to identify the nature and the position of the image formed by the concave lens. The lens formula is expressed as follows: \(\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\) where f is the focal length, v is the distance of the image from the centre and u is the distance of the object from the centre.

What is the difference between concave and convex lenses?

For a concave lens, R1 is negative and R2 is positive. The lens maker formula for concave lens is given by, 1 f = – (μ1 μ2 − 1) (1 R1 + 1 R2) For a convex lens, R1 is positive and R2is negative.

What is the lens formula for convex lens?

1. What is the Lens Formula for Convex Lens? Ans. According to the convex lens equation, 1/f = 1/v + 1/u. It relates the focal length of a lens with the distance of an object placed in front of it and the image formed of that object.

How to find the focal length of a concave lens?

According to the convex lens equation, 1/f = 1/v + 1/u. It relates the focal length of a lens with the distance of an object placed in front of it and the image formed of that object. 2. When is Image Virtual for a Concave Lens?

What is the lens formula used for?

The lens formula is used to identify the nature and the position of the image formed by the concave lens. The lens formula is expressed as follows: where f is the focal length, v is the distance of the image from the centre and u is the distance of the object from the centre. Similarly, the magnification of the image is given by the equation,

References:

A concave lens always form a real image it is true/ false?

Concave Lens – Definition, Formula, Image Formation

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Questions just answered:

Is the focal length of a concave lens always positive?

How to measure the focal length of a plano concave lens?

What is focal length of a lens?

How do you find the focal length of a concave mirror?

Why is it difficult to measure the focal length of concave lenses?

How do you find the virtual object of a concave lens?

What type of image does a concave lens produce?

What is virtual image formation in convex lens?

Which virtual image is the object of the second lens?

Do concave lenses form a real image of the virtual object?

What is the difference between concave and convex lenses?

What is the lens formula for convex lens?

How to find the focal length of a concave lens?

What is the lens formula used for?

What is the formula for concave lens?

What is the difference between convex and convex lenses?

Why do convex lenses refract light?

How do lenses magnify light?

Does a concave lens create magnification?

How does a convex lens magnify an object?

a concave lens cannot produce a real image

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