A 1-cm high object is placed 10 cm from a concave mirror with the focal length, f = 15 cm. Determine :A. The image distance?B. The image height?C. The properties of image formed by the concave mirror?
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1/v + 1/u = 1/f
By the question
f = - 15 cm
u = - 10 cm
A) 1/v = 1/f - 1/u
= -1/15 -(-1/10)
= -1/15 + 1/10
= -2 + 3 /30
= 1/30
1/v = 1/30
v = +30 cm
B) m= - v/u = -30/-10 = 3 cm
C) The image is virtual, erect and enlarged.
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