# What is the focus of a concave lens?

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

This is known as the principal focus of a concave mirror. The incident rays are converged by a convex lens. As a result, the rays converge in front of the lens at a single point.

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## Is the focal point of a concave lens positive or negative?

The focal length of a concave surface is negative, whereas the focal length of a convex surface is positive. Therefore, for a lens, the power of a concave and convex lens is negative and positive respectively.

## Is Focus negative in concave lens?

The power of the lens is the reciprocal of the focal length. A concave lens is a diverging lens, so it will always have a negative focal length.

## Why the focal length of concave lens is taken negative?

A concave lens diverges the rays incident on it. So the image will be formed behind the lens. So the image distance becomes negative.

## What is the use of concave lens?

Uses of a Concave Lens

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A concave lens is used to diverge incident rays. This helps to create a virtual image on the opposite side of the refracting surface. Hence, these lenses are used in binoculars, telescopes, cameras, flashlights and eyeglasses.

## What is the focal length of concave mirror positive or negative?

The focal length of a concave mirror is negative because the focus of a concave mirror is in front of the mirror, on the left side. Whereas, The focal length of a convex mirror is positive because the focus of a convex mirror is behind the mirror, on the right side.

## Which lens has real focus?

A convex lens has a real focus because all the light rays actually pass through the focus.

## Why does concave lens has virtual focus?

A concave lens has a virtual focus because the light rays do not actually pass through the focus.

## Is image distance negative in concave lens?

Image distance is always negative for a concave lens. Image distance is always positive for a convex mirror. The focal length is positive for convex lens and mirrors. ‘f’ is negative for concave mirrors and lens.

## Are real images always inverted?

Real image is found when the rays of light converge at a point after reflection on a mirror or after refraction through a lens. … If we placed an object above the x-axis then by geometry the rays will converge below the axis. Therefore, the image formed will be an inverted image. Hence, a real image is always inverted.