Group #: _________________________
Activity 1
Mirror, mirror, on the wall…
Objectives:
• Determine the height, width, and the distance from the mirror of the image formed by plane mirrors.
• Compare the actual height, width and the distance from the mirror of the object with that of the image
formed by plane mirror.
Materials:
• 1 (10 cm x 15 cm) plane mirror
• 1 graphing paper
• 10 one–peso coins
• modeling clay
• pen
Procedure:
1. Let the mirror stand vertically along a line on a graphing paper as shown in Figure 1. Use the modeling
clay to support the plane mirror.
Mirror
Modeling clay
2. Using a pen, make three (3) different marks along the intersections on the graphing paper in front of a
mirror
3. Measure the distance of each mark from the mirror by counting the number of parallel lines between the
mark and the base of the plane mirror. Record your data in a table similar to Table 1 below.
4. Look at the images of the marks formed by the mirror. Measure the distance of each image from the
mirror by counting the number of parallel lines between the image and the base of the mirror. Record this
also in Table 1.
Q1. Refer to Table 1, compare the distance (number of parallel lines) from the mirror of the object with that
of the image.
5. Stack 10 pieces of one-peso coin in front of the plane mirror as in Figure 2. Using a ruler, measure the
height and width of the stack of coins. Measure also the height and width of the image as seen on the mirror.
Enter your measurements in a table similar to Table 2.
Figure 2. Stack of Coins In front of the Plane Mirror
Description Object Image
Height (cm)
Width (cm)
Q2. How do the height and width of the object compare with the height and width of the image?
Group #; _______________________________
Activity 2
Angle of Incidence vs. Angle of Reflection
Objectives:
• Compare the angle of reflection and the angle of incidence.
• State one of the laws of reflection.
Materials:
• 1 plane mirror
• 1 low – frequency laser/ laser pen/laser pointer
• 1 paper protractor (see Appendix A)
Procedure:
1. Let the mirror stand vertically along the edge of the paper protractor as shown in Figure 4. Use
the clay to support the plane mirror.
Figure 4. A Plane mirror on a paper protractor
2. Position the laser beam such that it hits the mirror at an angle of 10 o with the normal line.
Measure the angle between the reflected ray and the normal line. Record your measurement in a
table similar to Table 3.
3. Make three trials and get the average.
4. Repeat steps 2 to 4 for angles 20o, 30o, 40o, and 50o. Enter all your measurements in Table 3.
Q3. How does the angle of incidence compare with the angle of reflection?
Q4. A periscope is an instrument for observation over, around or through
an obstacle. Explain how light travels in a periscope. Diagram the light rays as these pass through
the periscope.
Group #: __________________________
Activity 3
Mirror Left-Right Reversal
Objectives:
• Describe the images formed by plane mirror.
• Show an understanding of reversal effect in mirrors by writing laterally
inverted letters and words.
Materials:
• alphabet chart
• 1 plane mirror
Procedure:
1. Place the alphabet chart in front of the plane mirror. Identify all capital letters in the alphabet
that can be read properly in front of the mirror.
2. Write at least 3 words (all in capital letters) that can be read properly both with a mirror and
without a mirror in front of it.
Q5. What are the letters of the alphabet (in capital) that can be read properly in front of a mirror?
Q6. Think of words (in capital letters) that can be read properly both with a mirror and without a
mirror. What are these words?
Q7. Write the sentence below in such a way that it can be read properly in front of a mirror:
Honesty is the best policy.
