## What is the lens equation?

The lens equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). The magnification equation relates the ratio of the image distance and object distance to the ratio of the image height (hi) and object height (ho).

## What is a diverging lens called?

Also known as divergent lens, negative lens, concave lens or dispersive lens. A lens that causes parallel light rays to spread out – hence diverge – away from the optical axis once exiting the lens. The edge of a diverging lens is always thicker than the center.

## How do you use thin lens equation?

Step 1: Find the focal length of the mirror (remembering that convex mirrors have negative focal lengths, by convention). Step 2: Find the image distance using the thin lens equation. Step 3: Use the magnification equation to relate the object distances and heights.

## Can a diverging lens make a real image?

Plane mirrors, convex mirrors, and diverging lenses can never produce a real image. A concave mirror and a converging lens will only produce a real image if the object is located beyond the focal point (i.e., more than one focal length away). The image of an object is found to be upright and reduced in size.

## What is a mirror equation?

The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f).

## What is the formula of lens and mirror?

u is the Object distance. v is the Image distance. f is the Focal Length given by f=frac{R}{2} R is the radius of curvature of the spherical mirror.

## What is diverging lens used for?

Flashlights. Concave lenses are used on flashlights to magnify the light produced by the bulb. The light falls on the concave side of the lens, and the rays diverge on the other side, thereby increasing the apparent radius of the light source and providing a wider beam.

## Is concave lens?

A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).

## What is the difference between converging and diverging lenses?

A converging lens is said to have positive focal length. A converging lens causes exiting rays to be more convergent coming out than they were entering the lens. A diverging lens is said to have negative focal length. A converging lens can form a real image or a virtual image of a real object.

## What is thick lens formula?

The focal length of a thick lens in air can be calculated from the lensmaker’s equation: P=1f=(n−1)[1R1−1R2+(n−1)dnR1R2] P = 1 f = ( n − 1 ) [ 1 R 1 − 1 R 2 + ( n − 1 ) d n R 1 R 2 ] . The signs of the lens’ radii of curvature indicate whether the corresponding surfaces are convex or concave.

## What is the SI unit of power of lens?

Dioptre

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## Are real images always inverted?

Real images (images on the same side of the object) are always inverted. Virtual images (images on opposite side of an object) are always erect/ upright.

## Why can’t a diverging lens produce a real image?

A diverging lens never produces a real image because the actual light rays never converge. They always diverge. We find a virtual image by tracing them backwards to where our eye images they come from.

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