A student has two concave mirrors A and B of focal lengths 20 cm and 15 cm respectively. For each concave mirror he performs the experiment of image formation for three values of object distance of 30 cm, 10 cm and 20 cm. (a) For the three object distances, identify the mirror which will form an image equal in size to that of object. Give reason for your answer. (b) Draw a ray diagram to show the image formation in the above case. (c) Why is the focal length of a concave mirror taken negative?
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Locomotion is the ability of an organism to move. Walking, running, swimming, jumping are the different types of locomotion.
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