statement1: There is a time delay between actual sunrise and apparent sunrise.
statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.
statement 1 and 2 are correct but statement 2 is not the reason of statement 1
When the sun is just below the horizon, the light from the sun, while coming towards the earth, suffers refraction from a rarer to a denser layer and so it bends towards the normal at each refraction. Due to the continuous bending of light at different successive layers, the sun can be seen even when its actual position is just below the horizon.