![]() Thus, there is an increase by a factor of 2. The signs are given using sign convention. Given, the height of the image h’ = 4 cm, height of the object (h) = 2 cm and u = -12 cm (3 marks)Īns: As we know the magnification can be calculated using the following formulas: m = -v/u and also m = h’/h Determine it if the height of the image is 4 cm and height of the object is 2 cm. ![]() Ques: Find the image distance in case of convex mirror if the object is placed at 12 cm. Thus, there will be a decrease by a factor of 0.5. The signs are given byy using the sign convention. Ques: What is the magnification produced if the image distance is 6 cm and the object is located at 12 cm in case of concave mirror? (2 marks)Īns: We already know the magnification can be calculated using the following formula: m = -v/u To have a better understanding of the topic, refer to this video: But a sign for height of the image varies according to the type of image produced. Here, height of the object is positive as the object is usually above the principal axis. Magnification is also equal to the negative of the ratio of the image distance(v) to object distance(u). Here, h′ is the height of the image and h is the height of the object. It doesn't have any unit and can be expressed as: Magnification is represented by the ratio between the height of the image to that of the object. We can also find whether the image formed will be magnified, diminished, or equal to the object. The size of the image formed by a mirror is called Magnification. All the distances below the principal axis are to be taken negative.Distances that are perpendicular and lying above the principal axis are to be taken positive.All the distances measured from the pole (p) on the right-hand side of the mirror are taken to be positive and those on the left-hand side of the mirror are taken to be negative.The distances that are parallel to the principal axis are to be measured from the pole(p).This is to be followed in all situations. The object is kept on the left of the mirror. ![]() The principal axis acts as the x-axis of the coordinate system.The pole(p) of the mirror acts as the origin.The sign convention for spherical mirrors has a set of rules to be followed that is known as the “New Cartesian Sign Convention" as described below: ![]()
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