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## What is center of curvature in lens?

(a) Centre of curvature: It is **the centre of the spheres of which each surface of the lens forms a part**.Represented by C or 2f. (b) Principal axis: An imaginary straight line passing through the two centres of curvatures.

## Where is the Centre of curvature of a convex mirror?

In the convex type the reflection takes place on the outside surface of the sphere whilst in the concave type reflection is from the inside surface. The **centre of the spherical surface of** which the mirror forms a part is called the centre of curvature C of the mirror.

## What is the formula of centre of curvature?

Calculate the radius of curvature at the point (1,1) on the curve whose equation is x3 − 2xy + y3 = 0 and hence obtain the co-ordinates of the centre of curvature. **x = 1 + sinθ and y = sinθ − 1 2 cos 2θ** and hence obtain the co-ordinates of the centre of curvature.

## How many centre of curvature are there?

Centre of curvature: The centre of sphere of part of which a lens is formed is called the centre of curvature of the lens. Since concave and convex lenses are formed by the combination of two parts of spheres, therefore they have **two centres** of curvature.

## What are the examples of concave lens?

**There are many examples of concave lenses in real-life applications.**

- Binoculars and telescopes.
- Eye Glasses to correct nearsightedness.
- Cameras.
- Flashlights.
- Lasers (CD, DVD players for example).

## What is difference between concave and convex lenses?

A **convex lens is thicker at the centre and thinner at the edges**. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens.

## Where does the centre of curvature lie?

In geometry, the center of curvature of a curve is found at **a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector**. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature.

## What is the centre of curvature of a concave mirror?

Center of curvature can also be defined as the **point in the centre of the sphere from which the mirror was sliced**.It is represented by the letter C . Please note this that the centre of curvature lies outside the mirror’s reflecting surface. The centre of curvature of a concave mirror lies in front of it.

## What is the importance of Centre of curvature?

**Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror’s pole** and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus .

## Is 2 F Centre of curvature?

Answer: **Yes the centre of curvature C and 2F are same**. The centre of the curvature of the spherical lens is at the double of the focal length from the pole of the mirror located on the principal axis.