Use the Inverse square law, Intensity (I)<span> of a light </span>is inversely proportional to the square of the distance(d).
I=1/(d*d)
Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.
L1/L2=(D2*D2)/(D1*D1)
L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 <span>candela</span>
Answer:
<u>Charge</u><u> </u><u>of</u><u> </u><u>the</u><u> </u><u>particle</u><u> </u><u>is</u><u> </u><u>1</u><u> </u><u>coulomb</u><u>.</u>
Explanation:
Force, F:

F is magnetic force.
B is the magnetic flux density.
e is the charge of the particle.
V is the velocity

Answer:
A mirror that has a reflecting surface that is recessed inward is called concave mirror
Answer:
Pish posh idk xD im busy but ill help in a second
Explanation:
Answer: Velocity is the vector, which means it has both direction and magnitude . Velocity is defined as the speed of something in a given direction .
Explanation: