an object is placed at a distance of 20 cm from a convex mirror of focal lenght 25 cm. calculate the focal length of the image.discuss its nature
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we takes -ve sign for the object for a convex mirror
the distance of object = -20 cm
focal length +25cm
now using the mirror formula
1/f = 1/u + 1/v
1/25= -1/20 + 1/v
1/25 +1/20 = 1/v
4+5/100 = 1/v
9/100= 1/v
v = 100/9
the position of imAge will behind the mirror and the image will smaller in size
the distance of object = -20 cm
focal length +25cm
now using the mirror formula
1/f = 1/u + 1/v
1/25= -1/20 + 1/v
1/25 +1/20 = 1/v
4+5/100 = 1/v
9/100= 1/v
v = 100/9
the position of imAge will behind the mirror and the image will smaller in size
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