A convex mirror has a focal length of 18cm.The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?
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Answer:
Given : f= 18cm , h2 = h1
To find : u = ?
Solution : 1) h2 = h1
2h2 = h1 ………….(i )
M = ℎ2ℎ1 =−
ℎ22ℎ2 =− from eq i
12 =−
12 =− 1
1 =− 2 …. (ii)
According to the mirror formula
1 + 1 = 1
−2 + 1 = 118
−2+1 = 118
−1 = 118
u = -18 cm
Ans : the distance of the object from the mirror is 18 cm .
Explanation:
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