Digieducation...
Class 8 practical
Aim: To demonstrate the formation of multiple images by using two plane mirrors.
Aim: To demonstrate the formation of multiple images by using two plane mirrors.
Material required: Two mirror, a sheet of white paper, a ball and a tape.
Procedure:
1. Join the two plane mirrors with the tape to make a hinge .
2. Now place them vertically on the sheet of paper so that mirror make an angle of 90° .
3. Place the candle in between the mirrors and observe the number of images formed.
4. Now, change the angle between the mirrors to 120° and again record the number of images formed.
5. Repeat the activity for angles 45°, 60°, and 180° and record the number of images in each case
Observations: you will observe that the number of images formed increases as the angle between mirrors is reduced. You can calculate the number of images formed by the given formula _
Number of images=(360/n) -1
Wherr n is the angle between the two mirrors.
Hence, when angle was 90°, then
Number of images =(360/90) - 1= 4-1=3
When angle was 45°, then
Number of images =( 360/45)-1=8-1=7 and soon
Now , place the mirrors parallel to each other , In this case , the angle between them will be zero .
Hence, number of images=(360/0) -1= infinite -1=infinite
So, in this case ,you will find infinite number if images.
