Agiven individual is unable to see objects clearly when he is beyond 80 cm. what power lens should be used to correct this problem? a) -1.25 diopters b) -3.68 d c) -11.650485 d d) -0.2 d e) -15.686275 d

Explanation:

The person will have normal eye if he can see objects placed even at infinite  

distance. He suffers from short shortsightedness. He can not see beyond 80 cm. He requires diverging lens ( concave lens ) the focal length of which will be 80 cm , because in that case, light coming from infinity will appear to be coming from 80 cm so he can see them.  

Focal length in cm = - 80cm

Power =- 100/80 D = -1.25 Diopters

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

double the distance = divide strength by 4