Geometrical Optics-4

JEE Mains 2015 Guidance › Optics questions › Geometrical Optics-4

#Physics #Optics

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6 Answers

383

Soumyabrata Mondal ·2013-02-28 06:08:36

2√fg

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Akash Anand Wrong ..keep trying :)
Upvote·0· Reply ·2013-02-28 22:09:20
Soumyabrata Mondal speed of image w.r.t. mirror or object
Upvote·0· Reply ·2013-03-01 00:52:23
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661

Gaurav Gardi ·2013-02-28 22:05:38

2âˆš(fg)

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Akash Anand Wrong ..keep trying :)
Upvote·0· Reply ·2013-02-28 22:09:52
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333

Hardik Sheth ·2013-03-01 06:15:03

infinite?

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Anurag Roy How can it be infinite???
Upvote·0· Reply ·2013-03-01 06:40:52
Hardik Sheth i dint see f/2
Upvote·0· Reply ·2013-03-01 06:43:53
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101

Anurag Roy ·2013-03-01 06:42:08

âˆšfg????

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1161

Akash Anand ·2013-03-01 22:19:21

Correct answer is 34√3fg

Now try one again.

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Akash Anand *once
Upvote·0· Reply ·2013-03-02 00:55:25
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1161

Akash Anand ·2013-03-04 22:08:41

Here is some hint for this question. This question is bit lengthy.

dvdt=-(v²u²)dudt

At any time t,
u =f-gt²2
and v = (f+gt²)f(f-gt²)

Putting these values in equation we are going to get velocity of the image as a function of t.

v_i=((f+gt²)4f(f-gt²)²)²(gt)

After that all you want to maximize it.

If any one have some other easier method ..plz post it.

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Basic Integral Calculus Operators Symbols Matrix Cases

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