To see the full image, light rays from the top of the head and the bottom of the feet must reflect off the mirror and enter the observer's eye. Using the law of reflection (angle of incidence equals angle of reflection) and simple geometry, it can be shown that the necessary height of the mirror is half the height of the object (the person), and the top edge of the mirror should be positioned halfway between the top of the person's head and their eye. This minimum height holds true regardless of the distance the person stands from the mirror.
The minimum height of a plane mirror to see the full image of a person is equal to
Asked in UPPSC Upper Mains 2011 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
More Physics questions
- Red light is used in traffic signals because
- An object is placed between two parallel plane mirrors. The number of images formed is
- The red colour of the Sun at sunset and sun-rise is due to
- Consider the following statements: I. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is. II. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really it. Which of the above statements is/are correct?
- Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
- Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water. Reason (R): The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
- Consider the following natural phenomena: 1. Terrestrial heating 2. Reflection of light 3. Refraction of light 4. Diffraction of light Due to which of these phenomena is mirage formed?
- When a mirror is rotated by an angle of 6, the reflected ray will rotate by
