2.5D
5.0D
10.0D
25.0D
Correct answer is C
\(\frac{1}{v} = \frac{1}{u}\)
m = \(\frac{v}{u} = \frac{1}{4} = \frac{v}{50}\)
v = 12.5
But \(\frac{1}{v} + \frac{i}{u} = \frac{1}{f}\)
= \(\frac{1}{50} + \frac{1}{12.5} = f\)
f = 10m
P = \(\frac{100}{10} = 10D\)
A current of 2A passes through a wire of resistance 4Ω for 3 minutes. Calculate the energ...
The electrolyte used in the Nickel-Iron (NiFe) accumulator is ...
When a transformer has more secondary windings than primary windings, it? ...
Which of the following statements on the use of X-rays is incorrect? X-rays are used ...
The resultant force in a couple is ...
Dry Day 1 - 30°C | Day 2 - 29°C | Day 3 - 25°C Wet Day 1 - 22°C | Day 2 - 22&de...
An object is projected with a velocity of 100m-1 at an angle of 60° to the vertical. Calculate t...