state the laws of reflection and describe an experiment to verify them
Answers
Answer:
The two laws of reflection of light are as follows :
The angle of incidence is equal to the angle of reflection
The incident ray , the reflected ray and the normal at the point of incidence , all lie in the same plane.
Experiment to verify laws of reflection.
Fix a sheet of white paper on a drawing board and draw a line MM
1
as seen in the figure
Take a point O at the mid of the line and draw a line OA such that ∠MOA is lesser than 90
∘
, say 60
∘
Draw a normal ON on MM
1
at the point O , placing a small plane mirror vertically with the help of a stand with its silvered surface on the line MM
1
Fix two points P and Q at some distance vertically on line QA, on the board
Observe the other side of the normal , on the same side of the mirror , to see the images clearly P
1
and Q
1
of pins P and Q
Fix pin R in line with images P
1
and Q
1
as seen in the mirror
Fix one more pin S such that S is also in line with pin R as well the images P
1
and Q
1
of pins P and Q
Sketch small circles on the paper around the positions of pins as observed in the figure
Remove the pins and draw a line OB joining the point O to the pin points S and R
AO is the incidence ray, OB is the reflected ray , ∠AON=i , is the angle of incidence , ∠BON is the angle of reflection 'r' . ∠AON and ∠BON are measured and recorded in the observation table
The experiment is repeated for different angles such as 50
∘
,40
∘
,30
∘
for ∠MOA
From the observation it is observed that in each case , angle of incidence is equal to the angle of reflection , verifying the first law of reflection.
Since the experiment is carried out on a plane paper , the lower tips of all the four pins lie on the same plane , hence the incident ray , reflected ray and the normal at the point of incidence , all lie in the same plane . This verifies the second law of reflection.
Answer:
State the laws of reflection and describe an experiment to verify them.
Explanation: