The magnification formed by a concave lens of focal length of 20 cm and object is at 15 cm
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The magnification formed by a concave lens of focal length of 20 cm and object is at 15 cm
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the answer is minus four by seven....
-4/7
F=5 cm
V=-2 cm (virtual image)
Lens formula= 1/u - 1/v = 1/f
1/-20 - 1/u= 1/5
1/u= - 1/20 - 1/5= -5/20
U=-4 cm
Manification, m= v/u= -20/-4 = +5