Question

You use your 8.0× binoculars to focus on a yellow-rumped warbler (length 11 cm ) in a tree 20 m away from you. What angle (in degrees) does the image of the warbler subtend on your retina? Express your answer in degrees.

Answer 1

20) o - Distance llength of the warbler 11 cm 20-11m) Binoculars distance from tree Angle made with the object without Binoculars Height/ length of object Distance of object from free. o = 0.0055 radions with Binoculars, I 20 Oz magnification (M)=8= Angle after Binalay zoom Oz 0.0055 » Oz - 8 x 0-8055 Oz 20.044 radians the 0.1) 82 X ak Oz 360 on degree, Oz 20 20.049 X 360 뾼 = 2.52 %. The angle, the image of the warbler subtend to retiana is 2.52%