If you are given concave mirrors with focal length 10 cm, 15 cm and 20 cm, which one is most suitable for 1) a shaving mirror 2) a dentist's mirror

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Solution

Dear Student ,

The concave mirror with the shortest focal length (10 cm) is the most suitable for a dentist mirror, while the concave mirror with the longest focal length (20 cm) is the most suitable for a shaving mirror.
The concave mirror can produce various types of the images of objects, depending on the distance between the object and the mirror. The images could be real or virtual, diminished or magnified, upright or inverted.
Regards

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