Question

The image of an object is 8cm from the mirror. If the focal length of the mirror is 16cm. Then,determine the object distance
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Answer 1

Answer:

object distance is 8+8 is 16

Answer 2

object image  =v= -8cm

focal length= f= -16cm

so, applying mirror formula,

1/f = 1/v + 1/u

1/-16 = 1/-8 + 1/u

-1/16 + 1/8 = 1/u

Taking LCM,

-1+2/16 = 1/u

1/16 = 1/u

RECIPROCALING,  

SO, u= -16

length of object is always negative