Question

why cannot we see shadow of aeroplane when it is very high?

Answer 1

WHEN AEROPLANE IS FLYING VERY HIGH.
SUNLIGHT REACHES ON EARTH FROM SIDE OF THE PLANE. BECAUSE AEROPLANE IS VERY SMALL AS COMPARED TO THE SUN. THEREFORE, SHADOW OF THE AEROPLANE IS NOT FORMED ON EARTH 
BECAUSE SHADOW FORM ONLY WHEN SUNLIGHT NOT REACHES ON THE EARTH 
MARK AS BRAINLIST  PLZ....