Ultraviolet Radiation

[@RekhaKumari-tp3pj]

Nice video 👍

[@ramaakhetobandapneaaphojat2726]

Madam size of written words are too small on white board. Please make them larger .thanks

[@ramaakhetobandapneaaphojat2726]

Size of figures is also small. Thanks for this video.

[@miguelv.g824]

deal with it :)

[@An5505]

Nagkaroon din ako ng parang puti sa balat