When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror.
When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.
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2 Answers
U= -15
V= -10
F = let f be a x (we take -ative sign because the image is real and inverted) then f= -x
A/g
-⅒ -1/15 = 1/-x
-3/30 -2/30 =1/-x
-5/30 = 1/-x
5x = 30
x = 6
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V is taken as negative because it is formed in side where object is there. As the sign convention say that left side negative so we have taken it as negative.
front of mirror means the image is on the side of object... behind the mirror means it is in right side and hence +..
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