What is always true about lenses? PLEASE HELP I WILL GIVE YOU BRAINLEIST!! A. Lenses allow only one color through to the other side.
B. Lenses bend light to make an image of an object appear smaller or larger.
C. Lenses reflect light at the same angle the light comes in.
D. Lenses block all light to protect the eyes.

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk