# What happens when a mirror or lens is dipped in water?

We know that the refractive index of air is different than that of water, the converging capacity of a convex lens will change when it is immersed in water. Since water has a greater value of refractive index than air, the converging power of the lens will be less as compared to air.

## How can we solve the mirror problem?

1. Step 1: Make a list of the known quantities given in the problem.
2. Step 2: Determine if the unknown quantities require you to use the mirror equation, the magnification equation, or both.
3. Step 3: Solve the needed equation(s) symbolically for the unknown quantities.

## What is the formula of lens formula?

Let’s see how to use lens formula (1/v-1/u= 1/f) to locate images without having to draw ray diagrams.

## What is mirror formula?

The relation between focal length of mirror, distance of the object and distance of the image is known as mirror formula. It is given by. u1+v1=f1.

## WHY IS lens and mirror formula different?

The only difference between these two formulas is one having addition of mirror distance and object distance and another having subtraction of mirror distance and object distance.

## How do you use mirror formula?

1. u is the Object distance.
2. v is the Image distance.
3. f is the Focal Length given by. f = R 2.
4. R is the radius of curvature of the spherical mirror.

## What is magnification of mirror and lens?

The magnification, m produced by a spherical mirror can be expressed as: m=h′h where h′ is height of image and h is height of object. It is also equal to the negative of the ratio of the image distance(v) to object distance (u).

## How do you prove mirror formula?

Mirror Formula Derivation From the figure given above, it is obvious that the object AB is placed at a distance of U from P which is the pole of the mirror. From the diagram we can also say that the image A1B1 is formed at V from the mirror. This was the derivation of the mirror formula.

1. 1f.
2. 1f.
3. Or 1f.
4. Or f=uvu−v.
5. F=R2.

## Why does the focal length of a lens increase in water?

Since the relative refractive index of glass with respect to water is less than that of glass with respect to air, the bending of light at the interface of glass water is lesser and hence a parallel beam of light falling on the lens is bent less, to meet at point on the principal axis and hence the lens has more focal …

## Does focal length of mirror change in water?

Mirrors, spherical or otherwise, operate on the principle that the angle of reflection of a ray of light equals the angle at which it strikes the mirror’s surface. That behavior is not affected by the medium in which the light travels, so the mirror’s focal length would be no different in air or water.

## Does focal length of lens change in water?

Therefore, the focal length of a convex lens increases when it is immersed in water.

## What is the formula of image distance?

According to lens formual we have `(1)/(v) + (1)/(u) = (1)/(f)`, where u = distance of the object from the lens, v = distance of the image from the lens and f = focal length of given lens. The graph between object distance u and image distance v for a lens is given below. The focal length of the lens is.

## What is the power of a lens?

What is meant by the power of a lens? The power of a lens is the measure of the degree of divergence or convergence of the light ray striking it. The degree of divergence or convergence relies on the lens’s focal length.

## What is the distance of the image from the mirror?

Object Distance and Image Distance That is the image is the same distance behind the mirror as the object is in front of the mirror. If you stand a distance of 2 meters from a plane mirror, you must focus at a location 2 meters behind the mirror in order to view your image.

## What is the distance of a concave mirror?

At what distance from a concave mirror focal length 10 cm should an object 2 cm long be placed in order to get an erect image 6 cm tall? To find: Distance of the object from the mirror, u . Thus, the distance of the object from the mirror u is -6.67 cm.

## What is magnification of a mirror?

Magnification of mirrors Magnification is the increase in the image size produced by spherical mirrors with respect to the object size. It is the ratio of the height of the image to the height of the object and is denoted as m. The magnification, m produced by a spherical mirror can be expressed as: m=hh.

## What are the 6 types of lenses?

• The Standard Prime Lens. The Standard Prime Lens (or just Prime Lens) provides a fixed focal length.
• The Zoom Lens. Speaking of Zoom Lenses, the Zoom Lens might be your catchall lens.
• The Fisheye Lens.
• The Wide Angle Lens.
• The Telephoto Lens.
• The Macro Lens.

## What is the main difference between mirror and lens?

The core differences between the mirror and lens would be due to their construction and working. The mirror is the apparatus which reflects the light falling on them. Whereas, lenses are the ones that manipulate light. The mirror is having one side of reflective coating.

## How do you calculate the image distance of a convex mirror?

Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.

## How do you find the distance of an object in a mirror?

Step 1: Determine if the focal length is positive or negative. Step 2: Determine if the image distance is positive or negative. Step 3: Use the equation do=11f−1di d o = 1 1 f − 1 d i to calculate the distance of the object from the lens.

## Is focal length always positive?

The distance from the lens to the focal point is called the focal length. For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.