▶A convex mirror forms an erect image of an object of size one-third the size of object. If radius of curvature of concave mirror is 36 cm, find the position of image.
▶A convex mirror forms an erect image of an object of size one-third the size of object. If radius of curvature of concave mirror is 36 cm, find the position of image.
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Magnification = 3
R = 36 cm
f = R/2 = 36/2
f = 18 cm
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Magnification = -v/u
-v/u = 3
u = -3v ..(1)
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1/f = 1/u + 1/v
1/18 = 1/(-3v) + 1/v
1/18 = (1 + -3)/-3v
1/18 = -2/-3v
1/18 = 2/3v
v = 12 cm
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u = -3v
u = -3(12)
u = -36 cm