PREVIOUSLY ASKED IN:
WBPSC Miscellaneous Preliminary 2023
Answer
Convex mirror
Explanation
A convex mirror is used as the rear-view mirror in motor vehicles. Convex mirrors always form an erect, virtual, and diminished (smaller) image of an object. Because the images are diminished, it provides the driver with a much wider field of view compared to a plane mirror, allowing them to see a larger area of the road behind them.
Key Points
- > Convex mirrors always produce virtual, erect, and diminished images.
- > They are also used as security mirrors in shops and as street light reflectors.
- > Concave mirrors are used in vehicle headlights to produce parallel beams of light.
- > Dentists use concave mirrors to see enlarged images of teeth.
- > Standard looking glasses at home are Plane mirrors.
- > Mirror formula: \\( \\frac{1}{v} + \\frac{1}{u} = \\frac{1}{f} \\).
Additional Information
Types of Mirrors & Uses
| Mirror Type | Common Uses | Image Nature |
|---|---|---|
| Convex | Rear-view mirrors, blind corners | Erect & Diminished |
| Concave | Headlights, shaving mirrors, dentists | Real/Virtual, Enlarged |
| Plane | Dressing mirrors, periscopes | Erect & Same size |
Memory Tips
- Convex covers more: Convex curves outward, pushing the boundaries to cover a wider field of view for driving.