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The image formed by a spherical mirror is real inverted and is of magnification -2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formedif the object is moved 10 cm towards the mirror. |
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Answer» Solution :`m=-2` `v=-30cm` `u=?` `m=-v/u` `+2=(+(-30))/u` `u=(-30)/2u=-15cm`. The object distance is 15 cm MIRROR FORMULA `=1/v+1/u=1/f` `(-1)/30(-1)/15=(-15-30)/450=15/450=1/f` f=-10cm The focal length is 10 cm. If the object is moved 10 cm TOWARDS the mirror the image will be the NATURE virtual and erect and the singe will be enlarged. |
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