Download - RAY DIAGRAMS FOR CONCAVE MIRRORS
RAY DIAGRAMS FOR CONCAVE MIRRORS
Grade 10 Science – Optics UnitCardinal Ambrozic C.S.S.
Curved Mirrors are everywhere
Cloud Gate (The Chicago Bean) • Made by an artist Anish
Kapoor•168 stainless steel sheets• appears seamless•Inspired by liquid Mercury
•Convex outer portion
•Concave inner portion
A concave mirror is a mirror in which the reflecting surface is caved in
Another name for the concave mirror is a CONVERGING MIRROR.
EXAMPLES: Inside of a spoon Used in headlights Makeup Mirror
Concave Mirrors
CENTRE OF CURVATURE (C) - The centre point of a sphere that forms the curved mirror
PRINCIPAL AXIS (PA) – A horizontal line (90⁰) from the centre of curvature to the centre of the mirror
VERTEX (V) - The point where the principal axis meets the curved mirror.
CURVED MIRROR TERMS
FOCAL POINT (F) - A point half-way between the centre of curvature and the vertex where all parallel light rays come together.
FOCAL LENGTH (f) - The distance or length between the focal point and the vertex.
If you make part of the inner surface of the circle reflective, you create a concave mirror
C F V
f
Principal Axis
1. Place the bottom of the object on the principal axis.
2. Draw three incident rays from the top of your object and their respective reflected rays
3. Draw the image so that the bottom is on the principal axis and the top is where the 3 rays meet.
4. Determine the SALT characteristics of the image
Drawing Ray Diagrams for Concave Mirrors:
Refer to SMARTNote: Reflection Rules for Concave Mirrors
Drawing Incident and Reflected Rays in Curved Mirrors
C F
VPA
Mirror
S LargerA InvertedL In front of mirrorT Real
RAY DIAGRAM #1: Object between F and C
C F
VPA
Mirror
S SmallerA InvertedL In front of mirrorT Real
RAY DIAGRAM #2: Object beyond C
C F
VPA
Mirror
S LargerA UprightL Behind mirrorT Virtual
RAY DIAGRAM #3: Object between concave mirror and F