The focal length of concave mirror is 20 cm where you will place the object if you want an real, inverted and same size. Please answer this question it is important for me.
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As shown in the diagram, AB is the object placed at focus of the concave mirror. Now to find the position of image in a concave mirror we draw rays as mentioned in the diagram above. It is observed that the two rays are parallel to each other. Hence they meet at infinity. And we know that position of image is the point where these two rays meet. Therefore, the image so formed is at infinity.
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the object shud be placed at the centre of curvature in order to get the same size of the image as the object. that is : u = -40cm
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