Unpolarized light is passed through an optical filter that is oriented in the vertical direction. 1) if the incident intensity of the light is 90 w/m2, what is the intensity of the light that emerges from the filter? (express your answer to two significant figures.)

45 W/m^2

Explanation:

Intensity of light, Io = 90 W/m^2

According to the law of Malus

The average value of Cos^θ is half

So, I = Io/2

I = 90 /2

I = 45 W/m^2

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.