ये 3 चीजें हमेशा अपने पास रखना । way to success । motivation । #youtubeshorts । #shorts

While teaching the chapter " Our Environment " the teacher stressed upon the harmful effects of buring of fossil fuels, plastic, paper etc. The students noticed the extensive use of plastic and polythen in daily life, which can be avoided and the surroundings can be kept clean. they decided to make their school " plastic and polythene" free and motivated each other for its minimum use. (a) Why should the use pf polythene and plastic be reduced in daliy life ? (b) In what ways the students would have avoided the use of plastic and polythene in their school ? (c) How the students would have motivated each other for the success of their decision ?

In an experiment to measure focal length of a concave mirror , the value of focal length in successive observations turns out to be 17.3 cm , 17.8 cm , 18.3 cm , 18.2 cm , 17.9 cm and 18.0 cm . Calculate the mean absolute error and percentage error . Express the result in a proper way .