I. Kindly give an answer and explanation for what is asked in no. 3 and 9.

II. See no. 10-12. This last part of the procedure is quite confusing. Kindly explain how this part will be performed and how the data should be recorded. (What and where should be the image source? What and where is the object distance? What and where is the image distance and how is it different to the object distance?) Please present a drawing or illustration for clarity.

(NOTE: Please scroll down to see the progress of the activity performance below)

[The recorded angles of the incident ray and reflected ray is as follows: Light source 1 (30 degrees), Light Source 2 (20 degrees), Light source 3 (8 Degrees)]

LESSON ACTIVITY PROCEDURE:

\fPart 1:_lmage Formed by a Plane Mirror 1. Position the mirror at about 7 cm from the top of the graphing paper such that the reflecting surface rests on a grid line. Mark this line. 2. Mark a grid line perpendicular to the mirror. Choose a line at the middle. Call this the normal line. 3. Switch on the light source with the slit and position it such that the light ray coming out from the slit (incident ray) hits the surface of the mirror exactly at the normal line. What do you observe? 4. Position the source at 1 (see figurel). Orient the source such that the ray hits the mirror at an angle at the point where the normal line meets the mirror surface. You will see two rays. One ray comes from the source as it hits the mirror. This is the incident ray. The other which bounces off the mirror is the reflected ray. 5. Mark with a pencil two points on each of the rays. of3 10. 11. 12. Remove the light source and trace each ray observed by joining the two points using a pencil and foot rule. Measure the angles formed between the incident ray and the normal (angle of incidence) and the reflected ray and the normal (angle of reflection) with a protractor. Record your data in a table similar to the following data table below. Vary the position of the light source two more time (see experimental set up) and repeat step 4 to 7. Repeat these steps so that you will have three sets of data. Compare the angle of incidence to the angles of reflection. State the relationship between them. Using broken lines extend the three selected rays behind the line representing the mirror. Mark the point where the lines intersect. This point is the location of the image source. Measure the distance from the object to the mirror surface. This is the object distance. Measure also the distance from the mirror to the image. This is the image distance. Compare the object distance with the image distance. Table 1 Angle of Incidence Angle of reflection