REFRACTION OF LIGHT

 Definition of refraction of light

When light travels obliquely from one medium to another, the direction of propagation of light in the second medium changes. This phenomenon is known as refraction of light.
Light does not travel in same direction in all the medium because of difference in optical density.
  • When light enters from a higher density medium to a lower density medium light will bend away from the normal
  • When light enters from a lower density medium to a higher density medium light will bend towards the normal

Angle of incidence 

Angle made by the incident ray and the normal at the point of separation of two medium is known as angle of incidence 

Angle of refraction 

Angle made by the refracted ray and the normal at the point of separation of two medium is known as angle of refraction. 

Law of refraction of light 

  1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
  2. The ratio of sine of angle of incidence to the sine of angle of refraction is a constant. ( this law is known as snell’s law of refraction and this is true for angle 0<i<90⁰. If i is angle of incidence and r is angle of refraction, then
sin i / sin r = constant 

OUR YOUTUBE CHANNEL

OUR YOUTUBE CHANNEL

Most viewed

WORKING MODEL FOR SCIENCE EXHIBITION- DANCING BALLOON

Image
 DANCING BALLOON  SCIENCE EXHIBITION PROJECT FOR HIGH SCHOOL STUDENTS  A working model for science exhibition ‘THE DANCING BALLOON’ is an application of Newton’s third law of motion- Every action has an equal and opposite reaction and also explains about effect of less friction helps in the motion of a body. MATERIALS REQUIRED  1- Balloon  2- Compact disk (CD) 3- Glue 4- Bottle cap PROCEDURE  *Put a hole on bottle cap(at the centre)  * Using glue stick the bottle cap at the top of CD (cap should be fixed on rough and non shiny surface of CD . Make sure no gap between CD ad the bottle cap) * Keep it aside still glue dries up to make strong bond between CD and bottle cap * Inflate the ballon and fix it on bottle cap as shown in video  * And keep CD on plane surface and release it. RESULT Balloon/CD arrangement start moving around the plain surface automatically . SCIENTIFIC EXPLANATION  Due to the force applied by the air inside the balloon it start moves automatically. ( air released th
Read more
Image
This blog contents are specifically for high school students all over the world . Those who are preparing for GCSE physics and GCSE chemistry have lot of topic to refer from this blog. PHYSICS   CHEMISTRY   SCIENCE IN DAILY LIFE  SCIENCE EXHIBITION PROJECTS 
Read more

ELECTRIC CHARGES

Image
TYPE OF CHARGES  There are two type of electric charges, positive charge (+) and negative charge(-) PROPERTIES OF ELECTRIC CHARGES Unlike charges, always attract each other.  Positive charge kept near negative charge/ negative charge kept near positive charge, attract each other. Like charges always repel each other.  Positive charge kept near positive charge / negative charge kept near negative charge, repel each other. PRESENCE OF CHARGE IN MATTER All the materials around as are generally known as matters (matter is anything that can occupy space and have mass). All the matters are made up of tiny building unites called atoms. Atoms are made up of some small subatomic particles – electrons, protons, neutrons. The centre part of the atom is known as nuclear , which contain protons and neutrons . Protons are positively charged particles and neutrons are chargeless particle (neutral). And electrons which are revolving around the nuclear of an atom in fixed orbits has negative charge.
Read more

MAGNETS

Image
Magnets are substances which can attract some materials like iron, steel, nickel etc.  Different types of magnets  Based on shape of the magnets we can classify magnets into different names. Pictures and names of som magnets are given below                   A magnet always has 2 poles a north pole and a south pole ( when a magnet is cut into two pieces, the new pieces formed will act as separate magnets with a north pole and south pole for each                                     
Read more