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Subscribe to our Youtube Channel - https://you.tube/teachoo, Example What is the nature of the image? Practice: Using the mirror formula. Assumptions and Sign conventions Second Formula for Magnification Object Distance = u = –3 Practice: Nature and size of images from magnification. Find Magnification u and v are negative because they are in front of the mirror. Is the image larger or smaller than the object? An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. Given Solved example: Mirror formula. Now, that all these conventions are clear; let us know move on the mirror formula. Suppose Object distance is 3 cm in front of the mirror. An equation relating object distance and image distance with focal length is known as a mirror equation. Suppose Height of Object is 3 cm. c. Focal length which is represented as ‘f’. Determine the focal length of a convex mirror that produces an image that is 16.0 cm behind the mirror when the object is 28.5 cm from the mirror. In addition to the mirror formula, we have the magnification formula What is the magnification formula? 1 Mirrors having a curved reflecting surface are called as: a.plane mirror b. spherical mirrors. Given Ray Optics-Mirror Formula: Questions 1-5 of 7. And is written as : 1 v + 1 u = 1 f. Derive mirror formula of a concave mirrors. Find the size and the nature of the image. Image Distance = v d. none of the above Ans. A convex mirror of focal length f forms an image which is 1/n times the object. m = (ℎ )/(ℎ ) The magnification produced by a plane mirror is +1. Mirror Formula helps us to find: a. Practice: Concave and convex mirrors. is virtual and erect Height of image = h' = 12cm NCERT Question 13 - The derivation of the mirror formula is one of the most common questions asked in various board examinations as well as competitive examinations. The minus sign indicates that the … MCQs on Mirror Formula : 1. 2. b. Teachoo is free. If magnification (m) is Object distance which is represented as ‘u’. Magnification formula for mirrors. Find the nature and the size of the image. sign convention for mirrors Example At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? A mirror formula can be defined as the formula which gives the relationship between the distance of object ‘u’, the distance of image ‘v’, and the focal length of the mirror ‘f’. With respect to air the refractive index of ice is 1.31 and that of rock salt is 1.54. Object Distance = u A mirror formula may be defined as the formula which gives the relationship between the distance of image v, distance of object u, and the focal length of a mirror. Ans.A (Hint Spherical mirrors are of two types – Concave and Convex.) Get to the point NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics questions for your exams. The mirror formula is applicable both in spherical mirrors (concave mirrors and convex mirrors) and in plane mirrors. NCERT Question 14 - In the image, the red text is negative, and blue text is positive, It is Ratio of Height of Image to the Height of Object, Magnification = Height of Image/ Height of Object, There is another formula of magnification, Note : - Question 1 An object is placed at a distance of 10cm from a convex mirror of focal length 15cm.Find the position and nature of the image? So Magnification m is given by Therefore, m = 4 Find the position and nature of the image. Teachoo provides the best content available! m = (−(−12))/((−3)) Image distance which is represented as ‘v’. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Physics Grade XI Reference Note: Mirror formula for concave mirror when real image is formed and for convex mirror. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. The plus sign indicates that the image is real or the image is 15 cm in front of the mirror, on the same side as the object. Practice: Using the magnification formula for mirrors. The distance between the object and the pole of the mirror is called the object distance (u… The sign conventions for the given quantities in the mirror equation and magnification equations are as follows: f is + if the mirror is a concave mirror; f is - if the mirror is a convex mirror; d i is + if the image is a real image and located on the object's side of the mirror.