Activity 16.2 Class 8 Science Chapter 16 Solution

we will go through activity 16.2 class 8 science chapter 16 Light. In this activity 16.2, we will discuss the second law of reflection.

 Activity

  ·     Perform Activity 16.1 again.

  ·     This time use a sheet of stiff paper or chart paper.

  ·     Let the sheet project a little beyond the edge of the Table.

  ·     Cut the projecting portion of the sheet in the middle.

  ·     Look at the reflected ray.

  ·      Make sure that the reflected ray extends to the projected portion of the paper.

  ·     Bend that part of the projected portion on which the reflected ray falls.

  ·      Can you still see the reflected ray?

  ·     Bring the paper back to its original position.

  ·      Can you see the reflected ray again?

  ·     What do you infer?

Observation and explanation

We will use the material used in activity 16.1’, in this activity. The sheet of paper spread on the table represents one plane.

The incident ray from the torch incident on the mirror and gets reflected.

We can see the reflected ray on the sheet of paper.

Now we bend the part of the projected portion of the sheet where the reflected ray falls.

Now, we can’t see the reflected ray but when we spread the sheet again, the reflected ray is visible again.

Why did this happen?

When we bend the paper, we create a plane different

from the plane in which the incident ray and the normal lie but we can’t see the reflected ray.

When we spread the sheet, we can see an incident ray, normal, and reflected ray in the same plane.

 This activity infers the second law of reflection.

Conclusion

Activity 16.2 explains the second law of reflection.

Related Topics 

1. Activity 16.3

2. Activity 16.1