An object is present on the principal axis of a concave mirror at a distance 30cm from it.
Channel: Doubtnut
Date: 02/08/2020

An object is present on the principal axis of a concave mirror at a distance 30cm from it. Focal length of mirror is 20cm.  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_E01_418_Q01.png" width="80%"  Q. If object starts moving with `2cms^(-1)` perpendicular to principal axis above the principal axis then,