 # What Is V And U In Light?

r=u+v2..

## WHAT IS lens class 10th?

Lens Formula and Magnification: The relation between distance of object, distance of image and focal length for a lens is called lens formula. 1v−1u=1f. Where, v is the distance of image, u is the distance of object, and f is the focal length of lens.

## What is the relation between R and F?

The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2.

## What is U in mirror formula?

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.

## Why is V u at?

v=u+at is the first equation of motion. In this v=u+at equation, u is initial velocity. v is the final velocity.

## What is V and U in mirror formula?

It is also known as a mirror formula. In a spherical mirror: The distance between the object and the pole of the mirror is called the object distance(u). The distance between the image and the pole of the mirror is called Image distance(v).

## What is U and V in ray optics?

Lens formula: 1/object distance (u) + 1/image distance (v) = 1/focal length. 1/u + 1/v = 1/f. This applies to all types of lens as long as the correct sign convention is used when substituting values for the distances. (Reminder: we use the ‘real is positive, virtual is negative’ sign convention.)

## Is V positive for convex lens?

So the image distance is positive here. you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens. The reason is the sign altering of v.

## What is the power of a mirror?

Power of a lens or mirror is defined as reciprocal of focal length of a mirror or lens. If the focal length is large then the power of lens or mirror is small. If the focal length is small then the power of lens or mirror is large.

## Which is the correct expression for a mirror?

Correct Answer: D Magnification, m = – v/u A/C to mirror formula, 1/f = 1/v + 1/u or, 1/v = 1/f – 1/u or, v = uf / (u -f) Therefore, m = v/u = f / u -f IN THE LAST STEP ITS GIVEN THAT m = v/u BUT IN THE FIRST STEP ITS GIVEN m = – v/u CAN YOU JUST TELL ME WHATS GOING ON..??

## Is U positive in concave mirror?

➡ When the image is real, then “u” is always negative, “v” is always negative, ”f” is also always negative. ➡ When the image is virtual, then “u” is as it is negative, “v” is positive, ”f” is negative. THUS, IN CASE OF CONCAVE MIRROR, FOCAL LENGTH ALWAYS REMAINS NEGATIVE.

## Which mirror is used by dentist?

A concave mirror gives the dentist a magnified reflection of the mouth while also refracting a bit of light. This means the image in the mirror is larger, brighter, and, for the dentist, easier to see. Another plus of using a concave mirror is that the image in the mirror isn’t inverted.

## How do you tell if a mirror is concave or convex?

What are convex and concave mirrors? If the inner side of the spherical mirror is reflecting, it is called a concave mirror. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Concave mirrors can form inverted and real images and also virtual and erect images.

## What is the relation between UV and F?

The equation connecting the distance between mirror and object (u), distance between mirror and image (v), and the focal length of the mirror (f) is called mirror formula. From u-v graph : We can measure the focal length of the given concave mirror graphically by plotting graph between u and v.

## Is V negative in concave mirror?

Only U’s value is negative, while V and F are positive. Even in the last case of a concave mirror, when object is placed between the focal point and pole, it produces a virtual, erect and enlarged image behind the mirror.

## What is V U?

The “suvat” Equations Acceleration is the rate of change of velocity of an object. where a is acceleration, v is the final velocity of the object, u is the initial velocity of the object and t is the time that has elapsed. This equation can be rearranged to give: v = u + at.

## How do you find the focal length?

Focal length = (Object distance / ((1 / Magnification) + 1)) * 1000 ,Object distance is given in mm; and.Magnification does not have a unit.Dec 4, 2020

## Which type of mirror is used to form an image?

Answer. Answer: Plane mirror and convex mirrors only produce virtual images. only a concave mirror is capable of producing a real image and this only occurs if the object is located a distance Greater than a focal lenght from the mirrors surface .

## Can we see virtual image?

It can be saw on the that the light rays appear to emanate from the virtual image but do not actually exist at the position of the virtual image. Thus an image cannot be seen by placing a screen at the position of the virtual image.

## What is V and U in physics?

v = final velocity (the one it ended up with) u = initial velocity (the one it started with)

## Is V initial or final velocity?

Final velocity (v) of an object equals initial velocity (u) of that object plus acceleration (a) of the object times the elapsed time (t) from u to v. Use standard gravity, a = 9.80665 m/s2, for equations involving the Earth’s gravitational force as the acceleration rate of an object.