how our images form in concave and convex mirro r
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Image is formed behind the mirror. The image formed behind the mirrorwhen an object lies betweenlp P and F. In front of a convex mirror at any position, Image is erect, virtual, diminished and forms at other side of the object.Focal length of concave mirror by double in (u – v) method
It consists of a concave mirror two pins and three stands for pins and the mirror. The arrangement of pins and mirror on stands are adjusted as shown in figure.
First of all, the rough focal length of the mirror is found out by focusing a distance object on wall or in paper and measuring the distance between the mirror and sharp image.consists of a convex mirror mounted on a stand, and a plane mirror and a pin are adjusted on other two stands as shown in the figure. The plane mirror is held in front of the convex mirror with the top of the mirror lying on the principle axis of the convex mirror. An object pin is held in front of two mirrors and its position is adjusted such that there is no parallax between the image and the object seen through the two mirrors. The position of object pin, plane mirror and convex mirror are noted and we can determine
Object distance,uImage distance,v=PO=−PI=−(MI–PM)=(MO–PM)Object distance,u=POImage distance,v=−PI=−(MI–PM)=(MO–PM)
as MO = MI or u = v in plane mirror. Substituting these values, we can determine focal length of convex mirror.
Now, the object pin is placed at a distance 2 f from or at centre of curvature C of the mirror and an inverted image will be formed by the mirror which lies at the position of the object. Exact positions are determined by moving the pin towards or away from the mirror removing parallax. Now, as the object is placed within pole P and C, the image will be formed beyond C and when an object is placed beyond C and when an object is placed beyond C, an image will be formed with in P and C. In each case, a real inverted image will be formed, the position of which is determined by using second pin on which the image inverted touching the tips of each other as shown in the figure. Hence it is noted as we move our eyes across the mirror object and image must be together. Thus we obtain a pair of object distance and image distance and on substituting in mirror formula we can determine focal length of the mirror.
It consists of a concave mirror two pins and three stands for pins and the mirror. The arrangement of pins and mirror on stands are adjusted as shown in figure.
First of all, the rough focal length of the mirror is found out by focusing a distance object on wall or in paper and measuring the distance between the mirror and sharp image.consists of a convex mirror mounted on a stand, and a plane mirror and a pin are adjusted on other two stands as shown in the figure. The plane mirror is held in front of the convex mirror with the top of the mirror lying on the principle axis of the convex mirror. An object pin is held in front of two mirrors and its position is adjusted such that there is no parallax between the image and the object seen through the two mirrors. The position of object pin, plane mirror and convex mirror are noted and we can determine
Object distance,uImage distance,v=PO=−PI=−(MI–PM)=(MO–PM)Object distance,u=POImage distance,v=−PI=−(MI–PM)=(MO–PM)
as MO = MI or u = v in plane mirror. Substituting these values, we can determine focal length of convex mirror.
Now, the object pin is placed at a distance 2 f from or at centre of curvature C of the mirror and an inverted image will be formed by the mirror which lies at the position of the object. Exact positions are determined by moving the pin towards or away from the mirror removing parallax. Now, as the object is placed within pole P and C, the image will be formed beyond C and when an object is placed beyond C and when an object is placed beyond C, an image will be formed with in P and C. In each case, a real inverted image will be formed, the position of which is determined by using second pin on which the image inverted touching the tips of each other as shown in the figure. Hence it is noted as we move our eyes across the mirror object and image must be together. Thus we obtain a pair of object distance and image distance and on substituting in mirror formula we can determine focal length of the mirror.
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Virtual images are always formed by convex mirrors and are formed by concave mirrors when the object is placed in front of F. ... Plane mirrors and convex mirrors will always produce an upright image. A concave mirror will only produce an upright image if the object is located in front of the focal point
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