Table of Contents
Can you determine the focal length of concave mirror if u f?
The focal length of the concave mirror is f and distance of the object from the focus is u. The magnification of the image will be f/u.
How do you determine the focal length of a concave mirror?
By obtaining the Real image of a distant object at its focus, the focal length of the concave mirror can be estimated as shown in the diagram. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u).
How do you find U and V in a concave mirror?
Draw AB and AD perpendicular on x’ and y’- axis. For point A, the values of u and v will be the same. The coordinates at A is (2f, 2f) as u and v are same for a concave mirror when the object is placed at the centre of curvature. Hence, u = v = R = 2f.
Is focal length of concave mirror negative?
Focal length is positive for a convex mirror and negative for concave mirror.
Is focal length of concave mirror positive or negative?
f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.
On what factors focal length of a concave mirror depends?
Focal length of a spherical mirror depends on radius of curvature of the mirror.
How do you find out the focal length of the concave mirror quickly but approximately?
For determining the focal length of a concave mirror quickly but approximately, the object should be placed a considerable distance (or at infinity) from the concave mirror such that the image is formed at the focus.
How can you determine the focal length of a convex lens and concave mirror by simple methods?
To determine focal length of a convex lens Place the holder with the screen on the bench. The position of the screen should be such that the sharp image of the distant object is obtained on it. The difference between the position of the lens and the screen is equal to the focal length of the given convex lens.
How do you know if a focal length is positive or negative?
If an image appears on the same side of an object, then we use a negative focal length for determining information about the image’s distance, the possible power, the object’s distance, etc. If an image appears on the opposite side of an object, the focal length is positive.
Is focal length positive for concave mirror?
The focal length f of a concave mirror is positive, since it is a converging mirror. Figure 2. (a) Parallel rays reflected from a large spherical mirror do not all cross at a common point. (b) If a spherical mirror is small compared with its radius of curvature, parallel rays are focused to a common point.
What is the formula for a concave mirror?
The equation of concave mirror On the figure below, two beams of light are drawn to the concave mirror, and the concave mirror reflects the beam of light. s = do = object distance, s’ = di = image distance, h = P P’ = object height, h’ = Q Q’ = image height, F = the focal point of the concave mirror.
What is the focal point of a convex mirror?
One type of mirror, known as a convex mirror, has a reflective surface that curves outward. A convex mirror has a point where all the light that hits it appears to focus. This is called the focal point or sometimes simply the focus. The distance from the front of the mirror to the focal point is the focal length.
What is the magnification of a convex mirror?
a.) The magnification of a convex mirror is 0.60x for an object 2.9 from the mirror.
What are the characteristics of a convex mirror?
Convex mirrors. A convex mirror diagram showing the focus, focal length, centre of curvature, principal axis, etc. A convex mirror, diverging mirror, or fish eye mirror is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light.