Bones glow in dark. This is due to

Bone glow in the dark. This is due to

Bone glow in the dark. This is due to

Glow in discharge tube is due to

Adaptation of eyes in dark is due to:

Kerosene lamp glows continuosly until the kerosene is exhausted. This is due to the phenomenon of __________ .

Adaptation' of eyes in dark is due to