A convex lens produces a real inverted image 2.0 times magnified at a distance of 20cm from the lens. Calculate the focal length of the lens
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A convex lens produces a real inverted image 2.0 times magnified at a distance of 20cm from the lens. Calculate the focal length of the lens
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Answer:
F = 6.67 cm.
Explanation:
m = -2
v = +20cm
f = ?
m = v/u
-2 = 20/u
u = 20/-2 = -10 cm.
Now, by using lens formula,
1/v - 1/u = 1/f
1/20 - 1/-10 = 1/f
1/20 + 1/10 = 1/f
Now taking LCM, we get:
1+2/20 = 1/f
3/20 = 1/f
20/3 = f
6.67cm = f.
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