1. The image of a very distant car is located 51 cm... A spherical, concave, shaving mirror has a radius... A concave spherical mirror has a radius of... A car's outside rear-view mirror is convex, with... An object is 6 cm in front of a converging mirror... What is a Convex Mirror? Depending upon the location of the object with respect to the mirror, the size of the image formed by the concave mirror varies. Mean value of focal length of concave mirror = Result The focal length of the given concave mirror = 10 cm. Our experts can answer your tough homework and study questions. This article will help you find the focal length of a concave mirror. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. Let’s look at the theory to obtain the image of a farther object. All rights reserved. A concave mirror is a converging mirror. The convex mirror reflects the light outwards and so it is not used to focus light. Precautions. - Definition & Overview, Intensity in Physics: Definition & Measurement, What is Refraction? The distant object must be well illuminated to produce a well illuminated and distinct image. Initially, the size of the image is smaller than the object, but it gets larger as the object approaches the mirror. These mirrors are also known as the diverging mirrors. A convex mirror or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source. Dependent on the location of an object in front of the concave mirror, the image can be real or imaginary. 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 convex mirror is also called a diverging mirror or fish-eye mirror. - Definition, Uses & Equation, Convex Lens: Definition, Equation & Examples, Using Equations to Answer Mirror Questions, Mirrors: Difference Between Plane & Spherical, What is the Law of Reflection of Light? a wider and erect field of sight helps the driver in driving the vehicle with ease. A curved mirror in which a reflective surface bulges out towards the light source is known as convex mirror. The two qualities of the image formed by the convex mirror, viz. Consider a ray of light AB which is parallel to the principal axis and incident on a spherical mirror at point B. As a result, the image formed by these mirrors cannot be projected on the screen as the image is inside the mirror. Focal Length – The space between the pole P of concave mirror and the focus F is the focal length of concave mirror. Precautions. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u… Why is a Driving Mirror of Vehicles made of a Convex Mirror? Ans- The relationship between the radius of curvature and focal length r is represented by r =2f. Image obtained can be either virtual or real, The light rays get converged towards the principal axis, The light ray diverges away from the principal axis. A concave mirror has a reflecting surface that caves inwards. The mirror also converges the light at one prime focus point; hence they are also called as converging mirrors. The ray AB following reflection from the mirror will pass via F(concave mirror) or will appear to diverge from F(convex mirror) and obeys the law of reflection i.e., i = r. If the hole of the mirror is small, B lies close to P, and therefore BF = PF. Dependent on the location of an object in front of the concave mirror, the image can be real or imaginary. If the object is further from the focal length, the image is real and inverted. Ans-For all positions of an object, a convex mirror forms virtual, erect, and diminished image. In obtaining this relation, we have believed that the aperture of the mirror is small. The same can also be proved by using the mirror formula: Since we know that an object is always placed at the left side or direction opposite the incidence ray of the mirror, the object distance will always be negative. 10 cm is the focal length of the concave mirror. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. 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. 3. 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. What is the Focal Length of a Concave Lens and Convex Lens? 3) A convex mirror never forms a real image of a real object. Radius of curvature and focal length of a concave mirror are taken as negative and the same for convex mirror are taken positive. As the object comes nearer to the mirror, the size of the object gets larger until it reaches its original size. The polished surface of the concave mirror must face the distant object. Become a Study.com member to unlock this - Definition, Uses & Equation, Working Scholars® Bringing Tuition-Free College to the Community. The polished surface of the concave mirror and the distinct object should be facing each other. The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. Services, What is a Concave Mirror? If the object is closer to the mirror than the focal length, the image is imaginary and upright. Similar relation stands for convex mirror also. when rays fall naturally on the mirror. Focal Length of Convex Mirror Using Convex Lens, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Focal length – Focal length of the concave mirror is the distance between the pole P of concave mirror and the focus F. By obtaining the Real image of the distant object, the focal length of concave mirror can be determined, as shown in the diagram. Always place the concave mirror near an open window. Create your account. A concave mirror is a converging mirror. They are applied to focus light. The distance of an object is always negative. Convex mirrors reflect light outwards, therefore they are not used to focus light. The image created by a convex lens is erect and virtual since the focal point (F), and center of curvature (2F) are both imaginary points within the mirror that cannot be reached. The diagram below shows the convex mirror. A concave mirror should be always placed near an open window. 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