When an object is kept at a distance of 30\; cm from a concave mirror, the image is formed at a distance of 10\; cm from the mirror. If the object is moved with a speed of 9\; cms^{-1}, the speed (in\; cms^{-1}) with which image moves at that instant is _____.
Option: 1 1
Option: 2 2
Option: 3 3
Option: 4 4

Answers (1)

For concave mirror
 

\frac{1}{v}+\frac{1}{u}=\frac{1}{f} \\ And \ |\mathrm{m}|=\left|-\frac{\mathrm{v}}{\mathrm{u}}\right|=\frac{10}{30}=\frac{1}{3} \\ Now using \\ v_{\text {image }}=v_{\text {object }}\left(m^{2}\right) \\\Rightarrow v_{\text {image }}=9 \times \frac{1}{9}=1 \mathrm{~cm} / \mathrm{s}

Most Viewed Questions

Preparation Products

JEE Main Rank Booster 2022

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 9999/-
Buy Now
Knockout JEE Main 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes(Classes will start from Last week of September), Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
Test Series JEE Main 2022

Chapter/Subject/Full Mock Tests for JEE Main, Personalized Performance Report, Weakness Sheet, Complete Answer Key,.

₹ 4999/-
Buy Now
Rank Booster JEE Main 2020

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 9999/- ₹ 2/-
Buy Now
Knockout JEE Main 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes(Classes will start from Last week of September), Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 24999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions