Image formation by a concave mirror:
1. When position of object is at infinity, position of image is at principle focus (F). Image is real inverted highly diminished.
2. When position of object is in between infinity and centre of curvature (C), position of image is in between focus (F) and the centre of curvature (C). Image is real inverted diminished.
3. When position of object is at centre of curvature (C), position of image is also at the centre of curvature (C). Image is real inverted and same size of object.
4. When position of object is in between focus (F) and the centre of curvature (C), position of image is in between centre of curvature (C) and infinity. Image is real inverted magnified.
5. When position of object is at principle focus (F), position of image is also at infinity. Image is real inverted and highly magnified.
6. When position of object is in between focus (F) and pole (P), position of image is behind the mirror. Image is virtual erect and magnified.
Image formation by a convex mirror:
1. When position of object is at infinity, position of image is at principle focus (F). Image is virtual erect highly diminished.
2. When position of object is in between infinity and the pole (P) of the mirror, position of image is in between pole (P) and focus (F). Image is virtual erect diminished.
Use of concave mirror:
1. Concave mirror are used by dentist, as shaving mirror or in make up because when the teeth or face is kept between the pole and focus of the mirror, it gives virtual erect and magnified image.
2. Large concave mirror are used to concentrate sunlight in solar heating device. The substance to be heated is placed at the focus of the concave mirror, where the sunlight converges after reflection.
3. Concave mirrors are used in reflecting telescope.
4. Concave, paraboloid mirrors are used in search light, motor head light. If the bulb is placed at focus of the mirror then light travels a large distance.
Use of convex mirror:
1. Convex mirror is used as a rear-view mirror because it produces erect and diminished image. Since the image in small in size, so the field of view behind the vehicle is increased.
2. It is used in big shops to monitor the customers.
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