1. LENSES
INDICATOR:
1. RECOGNIZE THE CHARACTERISTIC OF AN
IMAGE FORMED BY A CONVEX LENS
2. LOCATE THE IMAGE BY USING A RAY
DIAGRAM
3. DISTINGUISH BETWEEN REAL AND
VIRTUAL IMAGE FORMED BY A LENS
4. DESIGN AND IMPLEMENT ACTIVITY TO
INVESTIGATE THE RELATION BETWEEN
IMAGE DISTANCE AND OBJECT DISTANCE
IN A LENS

2. CONVERGING LENS
F F
IT IS CALLED CONVERGING LENS BECAUSE
IT BENDS LIGHT INWARD

3. THERE ARE THREE KINDS OF
CONVEX LENS
A.BI-CONVEX
B.PLANO CONVEX
C.CONVEX-CONCAV

4. PRINCIPAL RAY FROM A
CONVEX LENS
A RAY PARALLEL TO THE PRINCIPAL AXIS
WHICH IS REFRECTED THROUGH THE
PRINCIPAL FOCUS F
A RAY THROUGH THE PRINCIPAL FOCUS F
WHICH IS REFRACTED PARALLEL TO THE
PRINCIPAL AXIS
A RAY THROUGH THE OPTICAL CENTER C
WHICH IS UNDEVIATED FOR A THIN LENS

5. RAY CONSTRUCTION FOR
CONVERGING LENSES
A RAY PARALLEL TO THE PRINCIPAL
AXIS WHICH IS REFRECTED THROUGH
THE PRINCIPAL FOCUS F
F C F

6. A RAY THROUGH THE PRINCIPAL FOCUS
F WHICH IS REFRACTED PARALLEL TO
THE PRINCIPAL AXIS
F C F

7. A RAY THROUGH THE OPTICAL
CENTER C WHICH IS UNDEVIATED FOR
A THIN LENS
F C F

8. DO THE ACTIVITY
INFORMATION
THE IMAGE FORMED BY A CONVERGING LENS CAN BE
OBTAINED BY DRAWING TWO OF THE FOLLOWING RAYS
1. LOCATED AND DESCRIBE THE IMAGE PRODUCE BY A
CONVEX LENS IF AN OBJECT IS PLACED SOME DISTANCE
BEYOND 2F
2. LOCATE2F F F 2F
AND DESCRIBE THE IMAGE PRODUCED BY A
CONVEX LENS IF AN OBJECT IS PLACED SOME DISTANCE
BETWEEN F AND C
2F F F 2F

9. OBJECT BEYOND 2F
2F F F 2F

10. OBJECT BETWEEN F AND C
2F F C F 2F

11. OBJECT BETWEEN 2F AND F
2F F F 2F

12. 2F F F 2F

13. SCREEN
CONVERGING LENS
LUMINOUS
OBJECT
SO Si

14. PROCEDURE OBJECT, A CONVERGING LENS IN
SET UP A LUMINOUS
A HOLDER AND WHITE SCREEN AS SHOW IN THE
FIGURE 15.25
SET UP THE OBJECT DISTANCE AND THE SCREEN
DISTANCE UNTIL A SHARP INVERTED IMAGE IS
FORMED ON THE SCREEN
MEASURE THE DISTANCE BETWEEN THE OBJECT AND
THE
LENS SO
MEASURE THE DISTANCE BETWEEN THE SCREEN AND THE LENS S
REPEAT ACTIVITIES NO. 2 TO NO. 4 AND RECORD THE
1 1
DATE IN THE TABLE BELOW
+
SO SI
CALCULATE FOR EACH DATA

15. 1 1
+
NO SO (Cm) Si (Cm) SO S I
1
2
3
4
5

16. CONCLUCION
THE IMAGE OF THE OBJECT IN FRONT OF
THE FOCUS IS REAL, INVERTED AND
ENLARGED
THE IMAGE OF THE OBJECT BETWEEN
FOCUS AND OPTICAL CENTER IS VIRTUAL,
ERECT AND ENLARGED
THE RELATIONSHIP BETWEEN THE
OBJECT DISTANCE, THE IMAGE DISTANCE,
AND THE FOCAL1LENGTH OF A LENS IS :
1 1
+ =
SO SI f