Curved Mirrors

Things to Learn Concave mirrors and convex mirrors Construction rules for curved mirrors Formation of images Uses of curved mirrors

Concave Mirrors Focal Length(FP) = R/2 Shiny Surface Radius of Curvature R C Center of Curvature F P Focus Pole Focal Length(FP) = R/2

Convex Mirrors Focal Length(FP) = R/2 Shiny Surface R Center of Curvature P F C Radius of Curvature Focus Pole Focal Length(FP) = R/2

Construction Rules of Curved Mirrors

(I) Concave Mirror 1. F C

2. F C

3. F C

(II) Convex Mirror 1. F C

2. F C

3. F C

Image Formation By Curved Mirror

The image formed is magnified and erect. Activities #1 Hold a concave mirror about 10cm away from you. Observe your image. The image formed is magnified and erect.

The image becomes diminished and inverted. Activities #2 Now ask your partner to hold the mirror and slowly walk away. Observe the change of the image. The image becomes diminished and inverted.

The nature of image depends on the position of object. Conclusion The nature of image depends on the position of object.

(1) Object behind C F C Image: Between C and F Nature: Inverted, diminished, real.

(2) Object at C Try yourself ! C F Image: At C Nature: Inverted, same size as the object, real.

(3) Object between C and F Try yourself ! Image: Behind C Nature: Inverted, magnified, real.

(4) Object at F Parallel beam C F Try yourself ! Image: At infinity

(5) Object between F and the mirror Try yourself ! Image: Behind the mirror Nature: Erect, magnified, virtual.

Convex Mirror F C Image: Behind the mirror Nature: Erect, diminished, virtual.

Uses of Curved Mirrors

Concave Mirrors 1. Shaving Mirrors / Make-up mirrors Image of the face is magnified

Concave Mirrors 2. Reflectors

Concave Mirrors 3. Reflecting telescope

Convex Mirrors 1. Rear-view Driving Mirror It gives a wider view than plane mirror.

Convex Mirrors 2. Surveillance Mirrors

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