Question

A perfectly reflecting flat mirror is uniformly illuminated by light striking it perpendicularly. The area of the mirror is 2.47 m ^2

and the light exerts a force of 1.67μN on it. Calculate the intensity I of the light.

Answer 1

To calculate the intensity of the light, divide the force exerted by the area of the mirror.

Step-by-step explanation:

To calculate the intensity of the light, we first need to convert the force exerted by the light into the momentum of the light.

The momentum is given by the equation p = F/A, where p is the momentum, F is the force, and A is the area of the mirror.

Rearranging the equation, we have F = pA.

Since the force is given as 1.67μN and the area is 2.47 m², we can substitute these values into the equation to find the intensity of the light:

Intensity = Force/Area

= (1.67μN)/(2.47 m²)

Now, we can calculate the intensity:

Intensity = (1.67μN)/(2.47 m²)

= 0.675μN/m²