Describe an experiment to show multiple reflection in two plane mirror.
Answers
Multiple reflections are seismic events that have undergone more than one reflection between source and detector. As a seismic wave travels through the earth, it is split into a reflected and a transmitted wave at each acoustic discontinuity.
Experiment :-
Problem:
How does the angle of two mirrors change the reflection of an object?
Materials
1) Protractor
2) Two identical, small plane mirrors
3) Modeling clay
4) Small object (coin, small figure, etc.)
5) Strip of paper
6) Pen
7) Plastic packing tape
Procedure:
Tape your mirrors together so that they can be opened and closed like a hinge. You want to leave a slight gap between the two edges (around 1/16th of an inch) to do this.
Taped Mirrors Diagram:
Mark angles of 30, 36, 45, 60, 90, 120 and 180 degrees on a piece of paper using your protractor.
Place the hinge of your mirrors at the vertex of your marked angles.
The first angle you will test will be 180 degrees.
Place your object (you can embed it in modeling clay if it won’t stand up on its own) in the middle of the mirrors and look at the reflection. How many objects do you see, including both reflected and real?
Keeping the object equally between the two mirrors, move the mirrors together into the other angles you marked out with your protractor. How many objects do you see at each angle? Is there something about the angle can help you predict how many objects you will see? Is every reflected image the same brightness?
Reflection Diagram:
Write a word on a piece of paper, and place it in between the mirrors at 60 degrees. Look closely at the second reflection (the reflection of the reflection). Can you read the text? Why do you think this is happening?
Results:
You will see an ever-increasing number of objects as you move the mirrors closer together (reducing the angle between them). Whenever you can see a whole number of images reflected, the angle of the mirrors will perfectly divide into 360 degrees. When you look at the reflection of a reflection you will be able to read the text in the mirror, as if you pointed a camera at the object. The reflections should get dimmer (more silvery) as the number of times they are reflected increases