Students you must know that in human beings, the small intestine in human beings is the site of complete digestion of food. The undigested food passes into large intestine that absorb most of the water from undigested food.

The given three indicators are natural indicators which so characteristics colours in acidic as well as in basic medium.

Crystallization forms, refers a shape and colour. Crystallization of Water of a part of crystal structure. Where we get shape and colour.

When a beam of light passes from a denser medium to a rarer medium, its velocity increases and wavelength decreases, per frequency remains constant.

Where, “i” (angle of incidence ) and Refractive index “n” = sin i/sin r. Where “r” (angle of refraction) and sin “i”/sin “r” for a particular medium remains same i.e., constant.