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## Is convex lens positive or negative?

Additional Information: Power of convex lens **is positive** as it converges the light rays incident on it. Convex lens is also referred to as a converging lens.

## What is the sign of U of convex lens?

Answer: See according to the New Cartesian Sign convention U i.e., the object distance is always in the left hand side of the lens or mirror i.e., to -X side. That is why U **is always taken as negative**. For focal length, f in lens is always taken as negative for concave and positive for convex.

## How do you know if a lens is concave or convex?

**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. Due to the diverging rays, it is called a diverging lens.

## Where is convex lens used?

Convex lenses are used in **microscopes, magnifying glasses and eyeglasses**. They are also used in the cameras to create real images of objects present at a distance.

## 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**.

## Is object distance positive or negative?

**Object distances are always positive**. Real images are always inverted and virtual images are upright.

## 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).

## How do you determine convex?

Definition of Convex

A convex shape is the opposite of a concave shape. **It curves outward**, and its middle is thicker than its edges. If you take a football or a rugby ball and place it as if you’re about to kick it, you’ll see that it has a convex shape—its ends are pointy, and it has a thick middle.