- Mirror formula, 1v+1u=1f (f is focal length, u is image distance and u is object distance)
- Magnification (mirror) = hightofimagehightofobject=hiho=−vu (hᵢ is image height and hₒ is object height)
- Lens formula, 1v−1u=1f.

Table of Contents

## What are the formulas of light?

Formula: c = f where: c = the speed of light = 300,000 km/s or 3.0 x 108 m/s. = the wavelength of light, usually measured in meters or Ångströms (1 Å = 10-10 m) f = the frequency at which light waves pass by, measured in units of per seconds (1/s).

## What is light in Physics for Class 10?

Light is electromagnetic radiation which shows both the properties of waves and particles. It is the form of energy and also keeps the Earth warm. It exists in the form of tiny energy packets known as photons. Each wave consists of the wavelength or the frequency.

## What is the formula of reflection of light?

Figure 1.5 The law of reflection states that the angle of reflection equals the angle of incidence— θ r = θ i . θ r = θ i . The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.

## What is V and U in light?

The distance between the object and the pole of the mirror is called Object distance(u). The distance between the image and the pole of the mirror is called Image distance(v). The distance between the Principal focus and the pole of the mirror is called Focal Length(f).

## What is U and V in light chapter?

u is the object distance. v is the image distance. => magnification = height of image/height of object.

## What is Snell’s law class 10?

Snell’s law is defined as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media”.

## What is a lens formula?

Lens equation or lens formula is an equation that relates the focal length, image distance, and object distance for a spherical mirror. It is given as, Lens Formula – 1/u + 1/v = 1/f. where.

## What is the lens formula Class 10?

v1−u1=f1.

## What is a ray of light?

The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.

## What is the speed of light Class 10?

c=3×105 km/s. Therefore, the speed of light is 300,000 km/s in vacuum.

## What is V in light chapter Class 10?

(v) laterally inverted. Absolute refractive index(n) of a medium is the ratio of speed of light in vacuum or air(c) to the speed of light in the medium(v) i.e. Refraction of light is the phenomenon of change in the path of light in going from one medium to another.

## What are the 3 laws of reflection?

Solution : There are three laws of reflection

1. The angle of reflection is equal to the angle of incidence .

2. The incident ray, the reflected ray and the normal lie in the same plane.

## What are the laws of light?

The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

## 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.

## What is 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.

## What is 1 V 1 U 1 f?

The lens formula 1v−1u=1f is valid when medium on both sides of the lens is air.

## What is V in lens?

In optics, the relationship between the distance of the image (v), the distance of the object (u), and the focal length (f) of the lens is given by the formula known as the Lens formula.

## What is P in light chapter?

Optical Centre: It is the centre of the lens. P Axis: It is the line passing straight through optical centre. Focus: Point where refracted rays meet or appear to meet. Focal length: The distance between the focus and the optical centre. 2f: Twice of focal length.

## What is mirror and lens formula?

Mirror formula is 1/f = 1/v + 1/u. Lena formula is 1/f = 1/v – 1/u.

## What is magnification formula?

Calculating magnification with the help of the lens formula: The magnification of a lens is defined as the ratio of the height of an image to the height of an object. It is also given in terms of image distance and object distance. It is equal to the ratio of image distance to that of object distance. m = h ′ h = v u.

## What is the SI unit of refractive index?

The refraction index has no unit as it is the ratio of two similar Quantities.

## What is power of lens Class 10?

Power of a lens is its ability to converge or diverge the rays of light falling on it. Power of a lens is equal to reciprocal of the focal length of the lens.SI unit of power is dioptre (D).

## What is Shell law?

This theorem has particular application to astronomy. Isaac Newton proved the shell theorem and stated that: A spherically symmetric body affects external objects gravitationally as though all of its mass were concentrated at a point at its center.

## 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.