# explain lens formula

This equation is generally expressed as. Numerical Methods In Lens (A) Lens Formula Definition: The equation relating the object distance (u), the image distance (v) and the focal length (f) of the lens is called the lens formula. concave lens: A lens having at least one concave surface, such that light rays passing through it bend away from its optical axis. Define lens formula. Q: 3. Is lens formula applicable only for convex lens? An object 5 cm high is held 25 cm away from a converging lens of focal length 20 cm. Q. Median response time is 34 minutes and may be longer for new subjects. The power of a lens is given by the equation $\text{P}=\frac{1}{\text{f}}$. The Lens Equation An image formed by a convex lens is described by the lens equation 1 u + 1 v = 1 f where uis the distance of the object from the lens; vis the distance of the image from the lens and fis the focal length, i.e., the distance of the focus from the lens… Key Terms. *Response times vary by subject and question complexity. ; The incident rays make small angles with the lens surface or the principal axis. A concave lens of focal length 15 cm forms an image 10 cm from the lens. convex lens: A lens having at least one convex surface, such that light passing through it, may be brought to a focus. Draw the ray diagram and find the position, size and nature of the image formed. Section 2: The Lens Equation 6 2. Explain Mirror - Lens Equation? The sign conventions for the given quantities in the lens equation and magnification equations are as follows: f is + if the lens is a double convex lens (converging lens) f is - if the lens is a double concave lens (diverging lens) d i is + if the image is a real image and located on the opposite side of the lens. A central equation in optics relates the focal length, object distance and image distance for a thin lens or mirror. Assumptions made: The lens is thin. Dear Student, The relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens is given by the formula known as Lens formula. Share 0. ; The lens has a small aperture. The object lies close to principal axis. 1/f=1/p+1/q, Where f is the focal length and p is the distance from the object to the lens and q is the distance from the lens … Explain lens formula Share with your friends. 1 v-1 u = 1 f. Lens formula is applicable for convex as well as concave lenses…