JEE Main 2022 · 28 Jul · Shift 2 · Physics Q28

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PhysicsInteger+4 / -1Question 28 of 90

An object 'o' is placed at a distance of 100 cm in front of a concave mirror of radius of curvature 200 cm as shown in the figure. The object starts moving towards the mirror at a speed 2 cm/s. The position of the image from the mirror after 10 s will be at ______ cm.

Object O on the principal axis in front of a concave mirror.

Your answer

Answer and worked solution

Official answer: 400

After 10 s the object is 80 cm away; $f=-100$ cm.

Mirror formula. $\frac1v=-\frac1{100}+\frac1{80}=\frac1{400}$ : the image is 400 cm behind the mirror (virtual).

Answer: 400

Topics:Spherical mirrors

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JEE Main 2022 · 28 Jul · Shift 2, Physics question 28