All Science Important formulas Physics for Class 10

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Important formulas Physics 
Formulas for Class 10

     

This blog consists of all Physics formulas for class 10 students. These are based on CBSE (NCERT).

 

 1: Reflection of Light

 Laws of Reflection:

1. Incident ray, reflected ray, and normal at the point of incidence lie in the same plane.

 

 

2. The angle of incidence is equal to the angle of reflection i.e., ∠i = ∠r

2.Reflection from a Plane Mirror:

 1. The image is virtual. The image and the object are equidistant from the mirror.                                               

2. The object size is equal to the image size i.e., magnification is 1. 

Reflection from a Plane Mirror:

1. New Cartesian sign convention (i) the distances are measured from the pole P(ii) the distances in the direction of the incident ray are positive.

2. Focal length is equal to the half of the radius of curvature i.e.

3. The object distance u, image distance v, and focal length f are related by the mirror formula:

                                                       (mirror formula)

4. The magnification is the ratio of image height to the object height. It is given by

                            

where

v – position of an image

u – Object of image

I – Size of image

O – Size of Object

Refraction of Light:-

1.Incident ray, refracted ray, and normal at the point of incidence lie in the same plane.

2. The angle of incidence is related to the angle of

refraction by Snell's Law:

Lens formula:

 The object distance u, image distance v and focal length f of a lens are related by the lens formula

where

v – position of an image

u – Object of image

I – Size of image

O – Size of Object

m – magnification of the lens

                                            

Power of the lens:

P = 1 / f ,

Power (P) will be in diopter if focal length(f) in metre.

3.Electricity

Current:- Current in a wire is equal to the charge flowing per unit time in it i.e.,

Potential difference:- Potential difference between two points is the work required to move a unit charge from one point to the other

i.e.,

Resistance:- Resistance of a wire of length l and cross-sectional area A is given by

where p is the resistivity of the wire material.

Ohm's Law:

V = iR

 

Some More Formula Based On Ohm’s law

 

Resistors in Parallel:

The equivalent resistance Req of three resistors connected in parallel is given by

Resistors in Series:

The equivalent resistance R_eq of two resistors connected in series is given by

Req = R1 + R2+ R3

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All Science Important formulas Physics for Class 10