 Why are lights in plane dimmed during take off and landing?
The lights in an airplane are dimmed during take off and landing as a precautionary measure to allow passengers' eyes to pre-adjust to lower light, in case of an emergency. It helps people to be aware of their surroundings during an emergency evacuation. Additionally, the emergency markings in the aisle and the exit signs are more visible in the dark. 
You may be a regular air traveller but have you ever wondered why planes dim their lights while taking off and landing? Many travellers are unclear whether it is a deliberate move on the part of the airline to draw the attention of the passengers or merely a dramatic stunt before commencing or ending the journey.Well, allow us to help and set things right.Also Read: Now, you can buy air-travel tickets on EMI