Light Test - 8

Object distance after shifting the object = 4 m + 0.5 m = 4.5 m For a plane mirror; Object distance = Image distance = 4.5 m Distance between the object and its image = 4.5 + 4.5 = 9 m

The letters that are not changed when the word is seen by reflection are: X, A, M, I, A, T, I, O i.e. 8 letters.

The dispersion of sunlight is the splitting of white light into rays of seven different colours. Just after the rain, there are a large number of water drops in the air which act like small prisms. As the white sunlight enters these water drops, the constituents of white light of different colours are refracted by different amounts, and a band of seven colours called rainbow is formed.

T is a laterally symmetrical object and hence its image in a plane mirror would be the same as itself.

Three plane mirrors are arranged at an angle to get a number of colored images in a kaleidoscope.

An ideal mirror reflects all the light.

A series of fast moving still pictures can create an illusion of movement as the eye can separate two images only when the interval of separation between them is one-sixteenth of a second. This happens due to a phenomenon called persistence of vision.

The inner layer of the eye called the choroid is black. This prevents internal reflections of light inside the human eye.