Two converging lenses with focal lengths of 40 cm and 20 cm are 16 cm apart. a 2.0 cm -tall object is 14 cm in front of the 40 cm -focal-length lens.
calculate the image position.
calculate the image height.

38.6 cm

2.8 cm

Explanation:

For converging lens of 40 cm :

f = focal length = 40 cm

p = object distance = 14 cm

q = image distance

o = height of the object = 2 cm

i = image height

using the lens equation

q = - 21.5 cm

using the equation for magnification as

i = 3.1 cm

For converging lens of 20 cm :

f = focal length = 20 cm

p = object distance = 21.5 + 20 = 41.5 cm

q = image distance

o = height of the object = 3.1 cm

i = image height

using the lens equation

q = 38.6  cm

image position : 38.6 cm

using the equation for magnification as

i = - 2.88 cm

image height = 2.8 cm

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.

vapour or gas assuming atmospheriv pressure