The radius of the Moon is 1737 x 106 m and the distance from

The radius of the Moon is 1.737 x 106 m, and the distance from the Earth to the Moon is 3.845 × 108 m.

Here ,

angular magnification for telescope , m = - fo/fe

fo = 66 cm

fe = 2.9 cm

r = 1.737 *10^6 m

d = 3.845 *10^8 m

angle of moon on normal eye , theta1 = arctan(2 * 1.737 *10^6/(3.845 *10^8))

theta1 = 0.00903 rad

Now , for the angular size of moon through telescope ,theta2

theta2/theta1 = angular magnification

theta2/(0.00903) = 66/2.9

theta2 = 0.206 radian

the angular size of moon produced by telescope is 0.206 radian