@analog_ias @indicontest @ongoingcontest @contest_alert b) dispersion of light#analogias#analoggoesonline #upscpreparation#contestalert@analog_ias@royneelanjan @technobux07 @subhasi20230426 @sikheaao @tanu56533762 @awatarjangid @urs_preet9 @santosh_godage @siddharth_atri @sanket_b23 @kumarsaheb1234 @tiwarijyoti2