object 60 CM tall is placed on the principal axis of a convex lens and its 30 cm tall image is formed on the screen placed at a distance of 40 cm from the object what is the focal length of the lens
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22
here's ur answer
focal length is 26.67 cm aprox
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Answer:
"According to the given details, we can take the value of h as 60 cm
H1 = -30 cm
V + u = 40 cm
H1/h = V/u
60/-30 = v/u
-2 = v/u
V = -2u
-2u = u = 40 cm
-u = 40 cm
U = -40 cm
V = -2 x -40
V = 80 cm
We need to find the focal length
1/F = 1/80 + 1/40
1/F = 1+ 2/80
1/F = 3/80 cm
F = 80/3
F = 26.67 cm
"
Explanation:
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