A concave mirror of focal length 10cm produces an image 5 times large and real. The distance of the object from the mirror will be?
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Answer:
The focal length (f) = 5 cm
The object distance (do) = 10 cm
Solution :
Formation of image by concave mirror :
Concave mirror – problems and solutions 1
The image distance :
The image distance :1/di = 1/f – 1/do
= 1/5 – 1/10
= 2/10 – 1/10
= 1/10
di = 10/1
= 10 cm
The image distance is 10 cm.The magnification :
m = –di / do
= -10/10
= -1
1 means that the image is the same as the object.
The minus sign indicates that the image is inverted. If the sign is positive than the image is upright.
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