3.3: Concave (Converging) Mirrors

Question 1

Concave Mirrors

Answer 1

reflects parallel lines to meet

Question 2

Principal Axis

Answer 2

Line that touches centre of mirror

Question 3

Centre of Curvature

Answer 3

where all normals meet

Question 4

Radius of Curvature

Answer 4

distance between V and C

Question 5

Vertex

Answer 5

where principal axis meets mirror

Question 6

Focal Point

Answer 6

where reflected rays pass through when incident rays parallel to principal axis

Question 7

Focal length

Answer 7

distance between V and F

Question 8

How to Locate Images in Concave Mirror?

Answer 8

Draw a ray diagram that has 2 or 3 incident rays from the top of the object.

Question 9

Why are 2 incident rays needed to find image?

Answer 9

At least need 2 in order to confirm the location of the image, using the intersection as reference

Question 10

Rules to Locate Image in Concave Mirror

Answer 10

1. when incident ray is parallel to principal axis = reflected through focal point
2. when travel through focal point = parallel to principal axis
3. when travel through center of curvature = reflected along same path
4. when strikes vertex = reflected is same angle

Question 11

Function of Concave Mirrors

Answer 11

Reflectors and Enlarging: headlights of cars, dentist mirrors, make up mirrors

Solar cookers: food or substance is placed at focal point, sunlight converges to heat it