Question

(3)
A concave mirror of focal length 18 cm forms an erect image, three times the size of the object.
How far is the object from the mirror?
(1) 36 cm
(2) 18 cm
(3) 15 cm
(4) 12 cm
​

Answer 1

Answer:

36

Explanation:

18×2

18 m from the back and 18 m front

Answer 2

18 m from the back and 18 m front

18×2 =36

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