DepEd MELC reviewer for Grade 10 Science, Quarter 2. Master the concepts, tables, and common-mistake warnings below.
1
The Electromagnetic Spectrum
Radio → Microwave → Infrared → Visible → UV → X-ray → Gamma
💡 Exam Hack
Left to right: increasing frequency & energy, decreasing wavelength. Visible light is a tiny middle band.
2
Reflection and Mirrors
Law of reflection: angle of incidence = angle of reflection. Concave mirrors converge light; convex mirrors diverge it.
3
Refraction and Lenses
Light bends when it changes medium. Convex (converging) lenses can form real images; concave (diverging) lenses form virtual images.
⚠️ Common Mistake
Convex lens = converging (thicker middle). Concave lens = diverging (thinner middle).
4
Uses of EM Waves
| Wave | Use |
|---|---|
| Radio | Broadcast, Wi-Fi |
| Microwave | Cooking, radar |
| Infrared | Remote controls, heat |
| X-ray | Medical imaging |
📌 Quick Recap — Master These
Before your test, make sure you can confidently do each of the following:
- Explain and apply The Electromagnetic Spectrum.
- Explain and apply Reflection and Mirrors.
- Explain and apply Refraction and Lenses.
- Explain and apply Uses of EM Waves.
Re-read any section above where you hesitate, then try the worked example again without looking.