4. Complete Activity 11.4 (Page 127). Stand in front of a plane mirror and look at your image. Raise your left hand. Which hand does your image raise? Now touch your right ear. Which ear does your hand touch in your image? Observe carefully. Now write down your name on a piece of paper and hold it in front of a plane mirror. How does it appear in the mirror?
Answer:
The activity can be carried out as follows:
Aim: To find the relation between the distance of the image from a plane mirror and that of the object in front of it.
Materials Required: Plane mirror, paper, sketchpen.
Procedure:
Part 1:
(i) Stand in front of a plane mirror and raise your left hand. Observe which hand your image in the plane mirror raises.
(ii) Then touch your right ear and observe which ear your hand touches in the image.
Part 2:
(i) Write down your name on a piece of paper with the sketchpen and hold it in front of a plane mirror. Observe what your name looks like in the mirror.
Observations:
Part 1:
We observe that:
- When you raise your left hand the image in the plane mirror raises the right hand as shown in the first figure.
- When you touch your right ear the image in the plane mirror touches the left ear.
- Only the sides are interchanged, the image will remain erect.
Part 2:
- We observe that when you hold the piece of paper with your name facing the plane mirror the letters are written in a strange manner as shown in the second figure below.
- The name and the letters seem to be written in reverse order from right to left, but the image remains erect.
Conclusions: We conclude from the above two cases that images of objects in a plane mirror are laterally inverted. This phenomenon is called lateral inversion.
“Stand in front of a plane mirror and look at your image. Raise your left hand. Which hand does your image raise? Now touch your right ear. Which ear does your hand touch in your image? Observe carefully. Now write down your name on a piece of paper and hold it in front of a plane mirror. How does it appear in the mirror?” – Solved.
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Extended Learning Problem 4
Solution to Extended Learning Problem 5
Solution to Extended Learning Problem 6
Solution to Activity 11.1
Solution to Activity 11.2
Solution to Activity 11.3
Solution to Activity 11.4
Solution to Activity 11.5
Solution to Activity 11.6
Solution to Activity 11.7
Solution to Activity 11.8
Solution to Activity 11.9
Solution to Activity 11.10
Solution to Activity 11.11
Solution to Activity 11.12
