NOTES 3 basic knowledge on some property.pptx

Description of some phenomenon

1. Class : FORM 3 SP MODULE III  : ENERGY : APPLICATIONS AND USES Date : 26/02/2025 GBHS Maroua Subject : PHYSICS NOTES F3

2. SCHEME OBJECTIVES PREREQUISITE KNOWLEDGE PROBLEME SITUATION ACTIVITIES INTEGRATION ACTIVITY ASSIGNMENT Class : FORM 3 SP MODULE III  : ENERGY: APPLICATIONS AND USES Date : 26/02/2025 GBHS Maroua Subject : PHYSICS

3. OBJECTIVES • Define and state the law of refraction. • Verify laws of refraction using a glass block • Numerical problems involving refractive index • Explain some effects of refraction. • Explain the phenomena of real and apparent depth qualitatively. • Define Critical angle (CA)and Total internal reflection (TIR) • use of CA, TIR/Solve problem Class : FORM 3 SP MODULE III  : ENERGY: APPLICATIONS AND USES Date : 26/02/2025 GBHS Maroua Subject : PHYSICS PREREQUISITE KNOWLEDGE Know how light travel

4. In Maga town, fishermen often struggle to accurately judge the depth of the water when trying to catch fish. This leads to difficulties in determining the best spots to fish, resulting in wasted time and resources. 1) Why do fishermen sometimes misjudge the depth of the water when looking at it from the shore? PROBLEME SITUATION

5. ACTIVITY 12.4 Experiment to determine the refractive index of a glass block

6. 12.5 Effects of refraction of light -A thin rod dipped obliquely into water appears to bent at the air-water surface. -A pool of water appears to be shallower than it actually is. -A colorful rainbow is formed in the atmosphere usually after some rainfall. -A shimmering pool of water seems to be ahead of a traveler on tarmac road or desert sand on a hot day (formation of a mirage).

7. 12.6 Real/apparent depth and refractive index

8. 12.7 Critical angle and Total internal reflection (TIR) Critical angle(CA) is the angle of incidence in the denser medium for which the angle of refraction is 90° in the less dense medium. Total internal reflection (TIR) is the reflection of light within a denser medium when light is incident in the same medium at angle greater than the critical angle.

9. Snell’s Law is the same thing as the second law of refraction , mathematically expressed as n 1 sin 1 = n 2 sin 2