JEE Main 2020 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 3 September 2020, Shift 2, Physics Q25

Question 25 of 75 in this shift, Physics question 25 of 25.

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 ________.

Official answer

1.00

NTA final key (Sep 2020).

Chapter: Ray Optics and Optical Instruments
Topic: Spherical Mirrors
Idea tested: Image Velocity (Axial Motion)

Same idea in other shifts

Asked 3× in all

10 Apr 2023, Shift 1 · Q47An object is placed at a distance of 12 cm in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror…EasySingle correct
26 Aug 2021, Shift 1 · Q8Car B overtakes another car A at a relative speed of $40\ \mathrm{ms^{-1}}$ . How fast will the image of car B appear to move in the mirror…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.