Question on: JAMB Physics - 2016
If the magnification of a virtual image formed by an object 10cm from a convex less is 3, then the focal length of the lens is
A
10cm
B
20cm
C
25cm
D
15cm
Ask EduPadi AI for a detailed answer
Correct Option: D
M = (\frac{v}{u}) = 3 = (\frac{v}{30}). V = 30m
(\frac{1}{u}) + (\frac{1}{v}) = (\frac{1}{f}) = (\frac{1}{10}) - (\frac{1}{30}) = (\frac{1}{f})
(\frac{3 - 1}{30}) = (\frac{1}{f}
f = (\frac{30}{2}) = 15cm
Add your answer
Please share this, thanks!
No responses