Class 10 Science

# Image Formation by Convex Mirror

These notes are based on the chapter Light: Reflection and Refraction from class 10 science NCERT book and CBSE syllabus

• Object at infinity
• Object between infinity and P
• Uses of concave mirror
• Uses of convex mirror

There are only two possibilities of position of object in the case of a convex mirror, i.e. object at infinity and object between infinity and pole of a convex mirror.

## Object at infinity

Fig: Object at infinity

When the object is at the infinity, a point sized image is formed at principal focus behind the convex mirror.

Properties of image: Image is highly diminished, virtual and erect.

## Object between infinity and pole

Fig: Object between infinity and P

When the object is between infinity and pole of a convex mirror, a diminished, virtual and erect image is formed between pole and focus behind the mirror.

Properties of image: Image is diminished, virtual and erect.

## Positions and Nature of Image in Convex Mirror

• Object at infinity: Image is formed at F, behind the mirror, image is virtual, erect and highly diminished in size
• Object between infinity and P: Image is formed between F and P, behind the mirror, image is virtual erect and diminished in size

## Uses of Concave Mirror

• As reflector in electric torch, head lights of vehicle, search light, etc. The source of light is put at the focus of the reflector, which produces a strong parallel beam of light, which helps in clear visibility.
• As shaving mirror to produce larger image of face to facilitate better viewing during shaving.
• Concave mirror is used by dentists to see larger image of teeth of the patient. When a tooth is placed between focus and pole, the concave mirror produces a magnified image of the tooth.
• As reflector in solar furnace. By using concave mirror in solar furnace the concentrated rays of sunlight is obtained at focus which produces enormous amount of heat because of concentration.

## Uses of Convex Mirror

• Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.
• Convex mirror is used on hairpin bends on the road; so that the driver can see the traffic approaching from another side of the bend.

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