The resolving limit of eye is `1min`. At a distance of `x km` from the eye, two persons stand with a lateral separation of `3m`. For the two persons to be just resolved by the naked eye, `x` shuold be

If the resolution limit of the eye is 1 minute and at a distance x km from the eye, two persons stands with a lateral separation of 3m , then calculate x for which the twok persons can be just resolved by the nacket eye.

Having two eyes gives a person :

Assuming the distance of the earth from the moon to be 38,400 km and the angle subtended by the moon at the eye of a person on the earth to be 31’, find the diameter of the moon.