What is the displacement method of focal length?
If the distance D of an object between an object and screen is greater than 4 times the focal length of a convex lens, then there are two positions of the lens between the object and the screen at which a sharp image of the object is formed on the screen. This method is called displacement method.
What is displacement method in convex lens?
In the displacement method, a convex lens is placed in between an object and a screen. If the magnifications in the two positions are m 1 and m 2 and the displacement of the lens between the two positions is x, then the focal length of the lens isA. x/m1-m22B. x/m1+m2C.
What is the formula of displacement method?
The weight of the displaced fluid can be found mathematically. The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has a weight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.
What is formula of convex lens?
1. What is the Lens Formula for Convex Lens? 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.
How do you find the focal length of a convex lens experimentally by U − V method?
i) Place the convex lens on a ‘V’ stand. . ii) Light a candle and take it far away from the lens along the principal axis. iii) Adjust the screen on the other side of the lens to get a clear image on it. iv) Measure the distance between the ‘V’ stand and the screen which gives a rough idea of focal length of the lens.
What is focal length of a convex lens?
The focal length of a convex lens is the distance between the center of a lens and its focus. The focal length of an optical instrument/object is a measure of how strongly/sharply the system converges/diverges light and it is just the inverse of the optical power of the system.
What is the focal length of convex lens?
What is the formula used to find focal length?
The focal length of a double convex lens is given by the formula (1/v) + (1/u) = (1/f), where u is the distance between the object and the lens, v is the distance between the image and the lens.
What is displacement method in photography?
This method is called displacement method. Let U = distance of an object from a convex lens. F = focal length. V = D – U = the distance of image from the lens. (a) If D < 4 f, then u is imaginary.
How do you find the position of a convex lens?
Let U = distance of an object from a convex lens. F = focal length. V = D – U = the distance of image from the lens. (a) If D < 4 f, then u is imaginary. So, physically no position of the lens is possible.
How do you find the distance of an object from a lens?
Let U = distance of an object from a convex lens. F = focal length. V = D – U = the distance of image from the lens. (a) If D < 4 f, then u is imaginary.