A parallel beam of monochromatic light of wavelength 663 nm is incident on a totally reflecting plane mirror. The angle of incidence is `60^@` and the number of photons striking the mirror per second is `1.0 xx 10^19`. Calculate the force exerted by the light beam on the mirror.

Explanation

To calculate the force exerted by the light beam on the mirror, we can follow these steps:

### Step 1: Understand the relationship between force and momentum
The force exerted by the light beam on the mirror can be calculated using the formula:
\[ F = \frac{\Delta p}{\Delta t} \]
where \( F \) is the force, \( \Delta p \) is the change in momentum, and \( \Delta t \) is the time interval.

### Step 2: Determine the change in momentum for one photon
...