Strategic Intervention Material for Refraction of Light

1. STRATEGIC
INTERVENTION
MATERIAL
for
Refraction of Light
Prepared by: ALVIN P. CAJILES
Teacher I
Narra National High School

2. Distinguish incident ray against refracted ray.
OBJECTIVE

3.  Swimming pool and ponds appear shallower than they
really are.
 A stone is at a deeper depth than where it appears to be.
 A stick bends in water.

4. Refraction is the change
in the direction of light
when it passes from one
medium to another of
different optical density.
Please be known that…

5. It is also defined as the
bending of light when it
enters from one
transparent medium into
another
Please be known that…

6. René Descartes and
Willebrord Snell first studied
refraction in the 17th century
by shining a narrow beam of
light onto a transparent
medium and measured two
angles – the angle of
incidence and the angle of
refraction.
Please be known that…

7. Try to look at this

8. Study this
o The index of refraction describes how much light bends as it
enters a medium.
o Light travels through a vacuum at a speed
and v is the speed of light in the substance.
o Light travels through materials at a speed less than its
speed in a vacuum.
o Formula for Index of Refraction:
o The higher the index of refraction, the slower light travels in
the substance.
sm1000.3 8
c
v
c
n 
materialin thelightofSpeed
in vacuumlightofSpeed

9. ACTIVITY CARD #1
LET’S WORK IT!
Instructions:
1. Materialsneeded:(A)pencil,test tubeandclamp
2. Clampthetest tube.
3. Placethepencilverticallybehindthetest tube.
4. Observewhathappenstothepencil.
5. Tellwhatis thereasonbehindthisincident.

10. Instructions:
1. Materials needed: (B) straw, glass and water
2. Pour water in the glass.
3. Put the straw inside the glass filled with water.
4. Observe what happens to image of the straw soaked in the
water.
5. Tell what is the reason behind the observed incident.
ACTIVITY CARD #2
LET’S WORK IT!

11. ACTIVITY CARD #3
REFRACTED OR
INCIDENT?
WHAT TO DO?
1. Materials needed:
penlight, transparent
glass
2. Place the glass over a
flat surface.
3. Turn-on the penlight,
point it towards the
glass in slanting
position.
4. Observe how light
passes through the
glass.
5. Identify the ray of
refraction and ray of
incidence when the
direction of the ray is

12. ASSESSMENT CARD: COMPLETE ME
C l o z e T e s t
Direction:
Complete the sentences by supplying the missing words.
When the light ray travels from air to water, the (1)
_______________ bends towards the normal. On the other
hand, when the light ray travels from water to air, it bends (2)
_____________ from the normal. The ray that strikes the
surface is called (3) _______________________.

13. ENRICHMENT
CARD:
COMPLETE ME
air
glass glass
water
(a)
(a)
Whattodo:Completethefollowing:

14. REFERENCE CARD
Acosta, Herma D. et.al, (2015), Science Grade 10
Learner’s Material 1st Edition, Department of
Education pp. 175
Silverio, A. A. & Bernas, G. D. (2012) Exploring Life
Through Science 2nd Edition, pp. 434 – 435
Zitzewits, Haase, & Harper (2013) Physics Principles
and Problems, p.492

15. Thank you!