Learn Unit III: Natural Phenomenon with Free Lessons & Tips

When we see any object through hot air over the fire, it appears wavy and slightly moving due to the phenomenon of atmospheric refraction. The hot air above the fire has different refractive indices due to temperature variations, causing light passing through it to bend and creating a distorted image.

Formula: A formula is a mathematical expression that describes a relationship between variables. It is used to calculate or derive values based on given parameters.

Lens formula: The lens formula relates the object distance (u), image distance (v), and focal length (f) of a lens. It is given by:

1/f=1/v−1/u

Power of lens: The power of a lens is a measure of its ability to bend light rays and is measured in diopters (D). It is given by the reciprocal of the focal length of the lens in meters:

P=1/f