Question
Physics Question on Ray optics and optical instruments
Light with an energy flux of 25 × 104 Wm-2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is:
A
2.50 × 10-6 N
B
1.20 × 10-6 N
C
3.0 × 10-6 N
D
1.25 × 10-6 N
Answer
2.50 × 10-6 N
Explanation
Solution
The correct option (A): 2.50 × 10-6 N