describe an experiment to verify the laws of reflection
Answers
Answer:
Laws of reflection.
(i) The incident ray, the reflected ray and the normal at the point of incidence, lie in the same plane.
(ii) The angle of Incidence and angle of reflection are equal I.e. ∠i=∠r.
Explanation:
Take a wooden drawing board and fix a white sheet of paper on it. In the middle of paper draw a straight line KK\ Mark a point B on it. Draw a perpendicular BN. Place a mirror XX' on line KK' such that the polished side of the mirror is along the line. Hold the mirror in the mirror holder.
Fix two steel pins P and Q on the straight line AB at least 10 cm apart. Look for the images of the pins P and Q and fix two pins P a such that P', Q', and images of P and Q are all in the same straight line. Remove the pins and draw small circles around the pinpricks.
Remove the mirror also. Join P'Q' and produce the straight line to meet at B. Measure ∠ABN = i and ∠CBN = r.
It is found that ∠i=∠r. This proves that the Angle of Incidence is equal to the Angle of Reflection.
As the incident ray, the reflected ray and the normal lie in the plane of the paper, therefore, they lie in the same plane.
➢ QUESTION :•
Describe an experiment to verify the laws of reflection .
➢ AnSwer࿐
➛ REFLECTION :•
When light falls on a smooth shiny surface ,it bounces off in one particular direction . This bounding of light is called REFLECTION of light .
➛ HOW REFLECTION OCCURS :•
Reflection occurs when a light ray strikes a shiny surface ( mirror ) and bounces off . The ray that strikes a shiny surface is called INCIDENT RAY . The ray that bounces off is called REFLECTED RAY . The point at which incident ray strikes is called a POINT OF INCIDENCE . The line perpendicular on the point of INCIDENCE is called NORMAL . Incident ray forms ANGLE OF INCIDENCE with the NORMAL . It is denoted by 'r' The angle that reflected ray forms with the normal is called ANGLE OF REFLECTION . It is denoted by 'r' .
➛ LAWS OF REFLECTION :•
It has been found experimentally that REFLECTION of light obeys certain laws as :
★ The ANGLE OF INCIDENCE is equal to the ANGLE OF REFLECTION .
★ The INCIDENT RAY , the refracted ray and the NORMAL at the oint of incidence all lie on the same plane .
➛ EXPERIMENT :•
- Fix a white paper on a drawing board using the drawing pins .
- Place a mirror strip AB ( fixed in a stand ) on the paper .
- Fix two common pins Q and R obliquely in front of of the mirror in a line .
- See the image of the pins in the mirror and fix two more common pins S and T in such a way that image of pins Q and R and pins S and T lie on the same straight line .
- Join the points Q, R, S, and T with the AB ( strip ) on point P . Draw a perpendicular line on P . It is NORMAL .
✤ Now , Oberse the ANGLE OF INCIDENCE Q P N that incident ray QR forms with the normal and the ANGLE OF REFRACTION NPT that reflected ray ST forms with the normal . We can See that :
➦ The ANGLE OF INCIDENCE is equal to the ANGLE OF REFLECTION .
➦ The INCIDENT RAY , THE REFLECTED RAY AND THE NORMAL on the point of INCIDENCE all lie on the same plane .
★ NOTE :•
Through the activity / experiment mentioned above we can verify the rules of reflection but before we would do an experiment it's important for us to check the important terms which are briefly described above . Go and check them first :)