Find out the practical applications of total internal reflection in our day to day life .
Medical field - Endoscope , In the field of communication - Optical fibre cables.

Give two practical applications of total internal reflection.

Find out the uses of lenses in our day to day life and record them in a science diary.

Variation of field with distance of a charged conducting shell is given below. R is the radius of the sphere.br From the graph find value of field at centre. Give on practical application of this result

On Arts day,180 sweets were distributed equally among the students. Tasting one sweet Deepa said,“It is a pity that 9 of our friends are absent today.” Hearing this Deepu said “Because of that we got one sweet more”: Find out the total number of students.