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JEE Mains 2015 Answers › Optics questions › ?????????

a short linear object of length b lies along axis of a concave mirror of focal length f at a distance u from the pole of mirror.The size of image is aprox. equal to???

#Physics #Optics

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8 Answers

1

Pavithra Ramamoorthy ·2009-03-31 19:50:27

fb/u ???????

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eureka123 ·2009-03-31 19:56:20

no

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ankit mahapatra ·2009-03-31 20:01:43

book main hai solution bataun ya hint dun

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24

eureka123 ·2009-03-31 20:05:08

agar tu previous year vale soln ki baat kar raha hai to sirf samjha de.......

agar kuch aur to pura soln post kar de...

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ankit mahapatra ·2009-03-31 20:11:53

first take mirror forumula and differentiate it with respect to x.
you get

|dv|=|v²/u²| *|du|

|dv|=size of the image
|du|=b

another form of mirror formula:

(v²/u²)=(f/u-f)²

now substitue the values

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eureka123 ·2009-03-31 20:18:57

ya explain that...........how mod (dv) is size of image???????

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ankit mahapatra ·2009-03-31 20:58:29

|dv| is taken because it is a short linear object.

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eureka123 ·2009-03-31 21:46:54

ok....i got that now.........thanx

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