Does the height depends on the distance between the person and the mirror?
You will see that you only need a mirror length of about 1/2 your height. This is due to the principle of reflection, which states that the angle of incidence equals the angle of reflection. A light ray from your foot strikes the mirror like a ball off a wall.
What is the minimum height of a plane mirror?
In order to see full image of a person, the minimum size of the mirror should be one half the person’s height. This is so because, in reflection, the angle of incidence is equal to angle of reflection. So, to see the image of a 6 ft tall person, a 3 ft long mirror is required.
Why does the height of the object is taken to be positive?
The height of the object is taken to be positive in a mirror. This is because of the cartesian coordinates. The object is placed in negative axes of the mirror while the image will be formed at the positive axes. The object is placed parallel to y axis, that why the height of the object is taken to be positive.
What is the relationship between an object’s height and its range?
Normally gravitational potential energy is changed into kinetic energy. That is, as an object falls toward the ground, the gravitational potential energy is changed into kinetic energy. It is easy to see that the amount of gravitational potential energy increases as the height h above the ground increases.
What is the relationship between speed and kinetic energy?
This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four. For a threefold increase in speed, the kinetic energy will increase by a factor of nine.
What is the relationship between height and energy?
Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.
What is the definition of object distance?
The object distance is the distance of the object to the centre line of the lens. The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens.
What is the symbol of image distance?
Image distance (sometimes confused with the focal length) is the distance from the virtual image to the mirror. This is denoted by the symbol di .
What is the mirror formula?
Suppose an object is placed u cm in front of a spherical mirror of focal length f such that the image is formed v cm from the mirror, then u, v and f are related by the equation; 1/f= 1/u + 1/v. This equation is referred to as the mirror formula. The formula holds for both concave and convex mirrors.
What is the relationship between image distance and object distance?
Starting from a large value, as the object distance decreases (i.e., the object is moved closer to the lens), the image distance increases; meanwhile, the image height increases. At the 2F point, the object distance equals the image distance and the object height equals the image height.
Is object distance always positive?
The object distance is always positive. It is the distance between the object and the lense, or mirror. The (real) image distance is positive on the other side in case of a lense. Only when the image is a virtual one, on the same side of the lense as the object, is the image distance negative.
How is magnification related to object distance?
The magnification, m, is defined as the ratio of the image height to the object height, which is closely related to the ratio of the image distance to the object distance: A magnification of 1 (plus or minus) means that the image is the same size as the object.
Is object distance negative in concave mirror?
object distance is always negative for all the lens & mirrors. image distance depends on object distance in case of concave mirror and convex lens. ‘v’ is always positive for convex mirror & concave lens.
What is the formula of convex lens?
What is the Lens Formula for Convex Lens? Ans. According to the convex lens equation, 1/f = 1/v + 1/u. It relates the focal length of a lens with the distance of an object placed in front of it and the image formed of that object.