# A Concave Mirror Has A Focal Length Of? The 194 Correct Answer

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## A concave mirror has a focal length of 4 cm and an object 2 cm tall is placed 9 cm away from it.

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## What is the mean value of focal length of concave mirror?

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Following is the mean value of the focal length of concave mirror: 10 cm is the focal length of the concave mirror. To get a well illuminated and distinct image of the distinct object, the distant object should be well illuminated.

Focal length of Concave mirror is the distance of the focus from the pole of the mirror and is represented as F = -r/2 or Focal Length Of A Concave Mirror = -Radius/2. Radius is a radial line from the focus to any point of a curve. How to calculate Focal length of Concave mirror?

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.

What is the value of F in a concave mirror?

f is the focal length of a concave mirror u is the distance of object needle from the pole of the mirror v is the distance of image needle from the pole of the mirror The value of f will be negative.

What is concave mirror and convex lens?

Determination of Focal Length … Is this page helpful? What is Concave Mirror and Convex Lens? A concave mirror which is also known as a converging mirror consists of a reflecting surface that has been recessed inward (away from the incident light). The concave mirror can reflect the light inward to one focal point.

How to determine the focal length of convex lens?

To determine the focal length of: Convex lens by obtaining the image of a distant object. How to find focal length of concave mirror? Following are the ways to obtain the focal length of the concave mirror:

## What is the position of the object in a concave mirror?

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A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object, when the image is virtual, will be : An object of height 2 cm is placed at a distance of 20 cm. in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image formed.

A concave mirror forms a real image equal in size to the object when the object is placed at the centre of curvature.

What happens when a concave mirror is placed close to an object?

When the concave mirror is placed very close to the object, a virtual and magnified image is obtained and if we increase the distance between the object and the mirror, the size of the image reduces and real images are formed. These real images can be projected on a screen.

What type of image is formed by a concave mirror?

Concave mirrors form both real and virtual images. When the concave mirror is placed very close to the object, a virtual and magnified image is obtained and if we increase the distance between the object and the mirror, the size of the image reduces and real images are formed.

How to find the position of the image formed by a mirror?

The intersection of these two rays after reflection gives the position of the image of the object. For a concave mirror any of the following four ray diagrams can be used for locating the image formed: a) A ray parallel to the principal axis, after reflection, will pass through the principal focus of a concave mirror.

How do you find the magnification power of a concave mirror?

Object distance is always positive (distance of a point from pole is positive in opposite direction to incident light and negative if along the direction of incident light). So, f of a concave mirror is always positive. Magnification power = m = v / u. Here, m = (v / u) = – 3. Signs of v and u are different.

## What distance should a screen be placed from a concave mirror?

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(1) An object of size 7 cm is placed at 25 cm in front of concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image.

How far should an object be from a concave mirror?

At what distance from the mirror should An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image?

How far from the mirror should a screen be placed?

A 3 cm tall object is placed 18 cm in front of a concave mirror of focal length 12 cm. At what distance from the mirror should a screen be placed to see a sharp image of the object on the screen. Also calculate the height of the image formed. – Science A 3 cm tall object is placed 18 cm in front of a concave mirror of focal length 12 cm.

What is the image formed at a distance of 15 cm?

When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. What is the focal length of the mirror? f is the focal length of the mirror.

How high should the screen be in front of the lens?

The screen should be at 37.5cm in front of the lens. The image will be 6cm high and it will be inverted. The image will be formed at a distance of 37.5cm from the mirror. It will be an inverted image.

## What is the principal focus of a concave and convex lens?

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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.

Answer: Principal focus of Convex lens : “Principal focus of convex lens” is the point on its ‘principal axis’ to that the light rays becomes parallel to the ‘ principal axis converge’ after the lens refraction. Principal focus of Concave lens : ‘The concave lens’ is the diverging lens.

What is the principle focus of a convex lens?

A principle focus of a convex lens is defined as the point on the principal axis on which the light rays coming parallel to the principal axis converge after getting refracted from the convex lens. A concave lens also known as the diverging lens is a type of lens that is thin in the middle and thicker at the edges.

What is a concave lens?

A concave lens also known as the diverging lens is a type of lens that is thin in the middle and thicker at the edges. It diverges the rays of light coming parallel to the principal axis.

What happens when a ray passes through a concave lens?

When a ray, passing through focus strikes concave or convex lenses, the reflected ray will pass parallel to the principal axis. When an object is placed at infinity, the real image is formed at the focus. The size of the image is much smaller than that of the object.

What is the principal focus of a lens?

When the “parallel rays of light” passes through the concave lens where the ‘refracted rays diverge ’ so that they can appear to come from a single point called “ the principal focus”. There is some distance between “the principal focus” and “the centre of the lens”, which is called ‘the focal length’.

References:

Focal length of a concave mirror – theory and experiment

A concave mirror has a focal length of 20 cm. Find the …

A concave mirror has a focal length of 15 cm. Where …

Determination Of Focal Length Of Concave Mirror And …

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How far should an object be from a concave mirror?

How far from the mirror should a screen be placed?

What is the image formed at a distance of 15 cm?

How high should the screen be in front of the lens?

What distance should a screen be placed from a concave mirror?

What is the principle focus of a convex lens?

What is a concave lens?

What happens when a ray passes through a concave lens?

What is the principal focus of a lens?

What is the principal focus of a concave and convex lens?

What happens when a concave mirror is placed close to an object?

What type of image is formed by a concave mirror?

How to find the position of the image formed by a mirror?

How do you find the magnification power of a concave mirror?

What is the position of the object in a concave mirror?

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

What is the value of F in a concave mirror?

What is concave mirror and convex lens?

How to determine the focal length of convex lens?

What is the mean value of focal length of concave mirror?

a concave mirror has a focal length of

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