A convex meniscus thin lens is made with the radius of curvature of the first convex surface being 25.0 cm and the second convex (towards object) surface 45.0 cm. If the glass used has index of refraction 1.500, what is the focal length of this lens?

112.5cm

Explanation:

Using the formula

1/f = (n-1)(1/R1 + 1/R2)

1/f = (1.5 - 1)(1/25 - 1/45)

1/f = 0.5 x (4/225) = 2/225

f = 225/2

= 112.5cm

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

a and c

c is 100% but i am confused in a