Activity 16.1 Class 8 Science Chapter 16 Solution

we will go through activity 16.1 class 8 science chapter 16 Light. In this activity 16.1, we will discuss the first law of reflection.

 

Activity

   ·     Fix a white sheet of paper on a drawing board or a table.

   ·     Take a comb and close all its openings except one in the middle.

   ·      You can use a strip of black paper for this purpose.

   ·     Hold the comb perpendicular to the sheet of paper.

   ·     Throw light from a torch through the opening of the comb from one side.

   ·     With a slight adjustment of the torch and the comb, you will see a ray of light along the paper on the other side of the comb.

   ·     Keep the comb and the torch steady.

   ·      Place a strip of a plane mirror in the path of the light ray.

   ·      What do you observe?

Observation activity 16.1 Class 8 Science

We get a light ray when a beam of light passes through a comb. we place a mirror in the path of the light ray, then we can see the other light ray coming from the mirror.

The light ray which strikes the mirror is called an incident ray and the ray coming from the mirror after striking is called a reflected ray.

Now we place a sheet of white paper, and draw the position of the mirror, incident ray, and reflected ray on it

Now we remove the comb and mirror and draw a perpendicular line called normal.

Now we measure the angle of reflection with respect to the angle of incidence and repeat this activity many times.

 

 

S.No.	Angle of incidence∠i	Angle of reflection ∠r
1	30°	30°
2	40°	40°
3	45°	45°
4	50°	50°
5	60°	60°

 

We can see the relationship between the angle of incidence and angles of reflection. Angles are the same.

The angle of incidence is always equal to the angle of reflection, this is the first law of reflection.

Conclusion

This activity explains the first law of reflection.

Related Topic

1. Activity 16.2