The device that converts alternating current to direct current is called

We have reason to see the sun a few minutes before the actual sunrise

The air bubble in the water, which will behave like it is

What type of light beam is obtained by flashlight?

Stands in front of the driver of the motor vehicle?

What is the refractive index of diamond?

Do doctors use to check patients' nose, ears, throat etc.?

Used in solar cooker?