11. The image of an object formed by a mirror is real, inverted and is

1.	11. The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at the distanceof 30 cm from the mirror, where is the object placed? Find the position of the image if the object is now moved 20 cmtowards the mirror. What is the nature of the image obtained? Justify your answer with the help of ray diagram. 3
Answer» When magnification is -1 then it means that object is placed at the center of curvature of the mirror now here we will have image distance 30 cm from the mirror now we can saym=-1=di/do so from above equation di=do=30cm also we know that when M = -1 then di=do=2fso f = 15 cm now when object is moved 20 cm towards the mirror new position of object from the mirror will be 10 cm now from mirror formula1/di+1/do=1/fdi=30cm also here magnification will be m=+3 so image will be virtual and magnified and formed at 30 cm distance behind the mirror

11. The image of an object formed by a mirror is real, inverted and is of magnification -1. If the image is at the distanceof 30 cm from the mirror, where is the object placed? Find the position of the image if the object is now moved 20 cmtowards the mirror. What is the nature of the image obtained? Justify your answer with the help of ray diagram. 3

Answer»

When magnification is -1 then it means that object is placed at the center of curvature of the mirror

now here we will have image distance 30 cm from the mirror

now we can saym=-1=di/do

so from above equation

di=do=30cm

also we know that when M = -1 then

di=do=2fso f = 15 cm

now when object is moved 20 cm towards the mirror

new position of object from the mirror will be 10 cm

now from mirror formula1/di+1/do=1/fdi=30cm

also here magnification will be

m=+3

so image will be virtual and magnified and formed at 30 cm distance behind the mirror