Question

JEE mains Previous year question chapter :- Geometrical Optics​

Answer 1

Answer:

Hi bro

Answer is in the attachment

Explanation:

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Answer 2

Answer

1/15m/s the speed of the image of the second car , option (c) is correct

Explanation:

For the mirror 1/v+ 1/u = 1/f

differentiate this equation w.r.t to t

-1/u² du/dt - 1/v² dv/dt = 0

=> dv/dt = - v²/u² (du/dt)

But, v/u = f/u-f

∴ dv/dt = -(f/u-f)²(du/dt)

= (0.2/-2.8-0.2) × 15 = 1/15m/s Answer

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Solution is also given in attachment