If the magnification of a virtual image formed by an obje...
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
10cm
20cm
25cm
15cm
Correct answer is 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
A car accelerates uniformly from rest at 5 ms-2. Determine its speed after 10s...
Which of the following is NOT an example of a percussion instrument? ...
Which of the following statements is/are not correct? ...
Which of the following correctly explains why soft iron is prefered to steel in electromagnets? i...
When two like charges are brought together, the potential energy of the system formed will ...
The force exerted on a charged body in an electric field depends on I. the charge on the body ...