Light - Reflection and Refraction

Refraction of light (9.3): name the 8 key ideas

• Glass slab (9.3.1) • Refractive index (9.3.2) • Spherical lenses (9.3.3) • Image by lenses (9.3.4) • Lens ray diagrams (9.3.5) • Lens sign convention (9.3.6) • Lens formula (9.3.7) • Power of a lens (9.3.8)

What is glass slab (9.3.1)?

Emergent ray is parallel to incident ray but shifted.

What are key terms?

Pole, centre of curvature, radius, principal axis and focus.

Spherical mirrors (9.2): name the 5 key ideas

• Key terms • Concave image table (9.2.1) • Ray diagrams (9.2.2) • Sign convention (9.2.3) • Mirror formula (9.2.4)

What is laws of reflection?

Angle of incidence equals angle of reflection; all in one plane.

What is laws of refraction?

Incident, refracted ray and normal in one plane; Snell's law.

Reflection of light (9.1): name the 2 key ideas

• Laws of reflection • Plane mirror image

Explain why: “R = 2f”

Radius of curvature is twice the focal length.