CLASS 9TH DAY 3
INTRODUCTION
Mirror । rorriM
Everyday we see ourselves in the mirror and adore ourselves. But do you know what is the science behind mirrors?
The image of an object as seen in a mirror is its mirror reflection or mirror image. In such an image, the right side of the object appears on the left side and vice versa. A mirror-image is therefore said to be laterally inverted and the phenomenon is called the lateral inversion.
Some letters don’t change upon reflection. In other words, they are the same as that of their Mirror Images. The letters having identical mirror images are A, H, I, M, O, T, U, V, W, X, Y. Similarly, in small letters we have i, l, o, v, w, and x that have the same Mirror Image as that of their original images. The number 1 and 8 are the only two numbers with their identical mirror images.
Why is AMBULANCE written inverted on emergency vehicles?
It is because the driver of the front vehicle can easily see and figure out that an emergency vehicle (AMBULANCE) is coming and this helps the driver to respond fast and he can give way to the AMBULANCE.
The number 1 and 8 are the only two numbers with their identical mirror images.
The world of mirrors is so fascinating, let’s solve some more examples to understand the phenomena behind lateral inversion.
Example 1. Choose the alternatives which closely resembles the mirror image of the given combination.
Solution: (b) Here, the mirror is placed vertically on the RHS on the question figure. Hence, only the figure given in answer figure (b) would be obtained as the correct mirror image.
Example 2.Choose the alternative which most closely resembles the mirror image of the given combination.
Example 3. A clock seen through a mirror shows quarter to three. What is the correct time shown by the clock?
(a) 8 : 15 (b) 9 : 12 (c) 8 : 17 (d) 9 : 15
Solution: (d) Here,
It is clear from Fix. (X) that if seen through a mirror the time indicated by clock is 2 .45. When the mirror is placed vertically at AB, the mirror image i.e., Fig. (Y) shows the actual time in the clock i.e., (9 : 15).
Example 4. Choose the correct mirror image from the answer figures (a), (b), (c) and (d).
Solution: (b) Here, the mirror is placed horizontally at AB on the top of the question figure.Hence only answer figure (b) is the vertically inverted form of question figure in which top and bottom interchange places while LHS and RHS remain the same.
Mirror mirror on the wall, what do you want to say to us all ?
Here is a small quiz to test your understanding. Try to attempt all the questions and get the highest marks possible.
THINK OUT OF THE BOX - Math riddles
People enjoy activities such as games, magic shows, contests, and puzzles. Therefore, it is not surprising to find students enjoying similar activities based on mathematics. Here are some math riddles to make you think out of the box.
