Uses Of Convex Lens

• Magnifying glasses.
• Eyeglasses.
• Cameras.
• Microscopes.

## What is a double concave lens?

Bi-Concave (Double-Concave) lenses have equal radius of curvature on both sides of the lens and function similarly to plano-concave lenses by causing collimated incident light to diverge.

## What is a double convex lens used for?

Double convex lenses have focal points on both sides of the lens; these and the points at twice the focal length are used to locate objects and images. When the object is outside 2F, the image will be between F and 2F on the other side and will be inverted, diminished, and real.

## What is the focal length of a double concave lens?

Therefore, the focal length of the given double concave lens is equal to 40cm.

## What is the focal length of concave lens?

For a diverging lens (for example a concave lens), the focal length is negative and is the distance to the point from which a collimated beam appears to be diverging after passing through the lens.

## What is the focal length of a lens?

The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.

## What is the focal length of concave and convex lens?

Viva Questions

Convex lens Concave lens
The focal length is positive The focal length is negative
Image obtained can be either real or virtual Image obtained is always virtual
The light rays are converged towards the principal axis The light rays diverge away from the principal axis

## How do you measure the focal length of a concave lens?

You can calculate the focal length of the concave lens using the formula f2 = (f1F/(f1-F).