# focal length of a concave mirror is

Radius of curvature and focal length of a concave mirror are taken as negative and the same for convex mirror are taken positive. . View Answer. The polished surface of the concave mirror and the distinct object should be facing each other. A concave mirror produces both real and virtual images, which can be upright or inverted. Determine the image distance and the image size. For a thick lens (one which has a non-negligible thickness), or an imaging system consisting of several lenses or mirrors (e.g. C (p f ) 2 1 D − f p E − f p. MEDIUM. Method (2). The rays of light coming from a distant object such as the sun or a distant tree can be considered parallel to each other. Find the position of the image. A concave mirror is a curved mirror that forms a part of a sphere and designed in such a way that rays of light falling on its shiny surface converge upon reflection. Solution: The radius of curvature of the mirror = 30 cm Thus, the focal length of the mirror =$$\frac { 30 cm }{ 2 }$$ = 15 cm. Materials Required A concave mirror, a mirror holder, a small screen fixed on a stand, a measuring scale and a distant object (a tree visible clearly through an open window). Draw a ray diagram to show the formation of image of an object placed beyond the center of curvature of a concave mirror. so, when A concave mirror of focal length f (in air ) is immersed in water then, the focal length of the mirror in water remains constant e.g., f. [ note : law of refraction depends on refractive index of medium, that's why lens maker formula is given by, where is refractive index of medium] ptoppo277 ptoppo277 Answer: options. Half this distance is the focal length of the mirror. 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. Find the position of the image. Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. A 4.0-cm tall light bulb is placed a distance of 8.3 cm from a concave mirror having a focal length of 15.2 cm. Solution: We have u = … Focal length of Concave Mirror. A 2. a. To determine the focal length of concave mirror by obtaining the image of a distant object. To get a well illuminated and distinct image of the distinct object, the distant object should be well illuminated. Answer. The focal length of a concave mirror is f and the distance from the object to the principal focus is p. The ratio of the size of the real image to the size of the object is: A − p f B (p f ) 2. A concave mirror should be always placed near an open window. Explanation: Mirror focal length is constant. Focal length – The distance between the pole and the focus and is one-half of the radius of curvature Object distance – The distance between the object and the pole Image distance – The distance between the image and the pole Concave Mirror Ray Diagram The distance between an object its doubly magnified by a concave mirror of focal length f is. focal length f = R/2 Radius of curvature R =10 cm f= 10/2 = 5 cm The distance between mirror and screen is measured. Example 4: An object is placed at a distance of 15 cm from a concave mirror of focal length 10 cm. 10 cm is the focal length of the concave mirror. Solution: The radius of curvature of the mirror = 30 cm Thus, the focal length of the mirror =$$\frac { 30 cm }{ 2 }$$ = 15 cm. A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure. MEDIUM. State the position, size and nature of the image. Solution: We have u = … mirror, and hence both must be situated in a plane passing through the centre of curvature and at right angles to the axis. View Answer. Again, begin by … MEDIUM. Hence, it is also called a converging mirror. (image will be … (NOTE: this is the same object and the same mirror, only this time the object is placed closer to the mirror.) A concave mirror, like a plane mirror, obeys the laws of reflection of light. To measure the focal length of a concave mirror. Disqus Comments. Precautions. Example 4: An object is placed at a distance of 15 cm from a concave mirror of focal length 10 cm. a photographic lens or a telescope), the focal length is often called the effective focal length (EFL), to distinguish it from other commonly used parameters: The size of the image can be bigger or smaller than the object. The distance of real image is negative, while that of a virtual image is positive. The distance of an object is always negative. Theory/Principle The spherical mirror with inward curved reflecting surface is called concave mirror.

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