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Biology; Chemistry; Physics: Post your doubts here!

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A student takes three lenses from a drawer labelled ‘convex lenses: f = 15 cm’.
(a) Describe, with the aid of a labelled diagram, how the student quickly checks that the lenses
have the correct focal length.

please just explain without diagram !!!
 
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A student takes three lenses from a drawer labelled ‘convex lenses: f = 15 cm’.
(a) Describe, with the aid of a labelled diagram, how the student quickly checks that the lenses
have the correct focal length.

please just explain without diagram !!!

year?
 
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Good Luck everyone .. Please pray for me and all others who are appearing today that we all get good marks and the paper is easy and not tricky! :)
 
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A student takes three lenses from a drawer labelled ‘convex lenses: f = 15 cm’.
(a) Describe, with the aid of a labelled diagram, how the student quickly checks that the lenses
have the correct focal length.

please just explain without diagram !!!
student takes any objects and focuses its image on wall(or any mirror as a screen.lens is moved towards screen.lenghth of lens from screen is measured at the point when sharp image forms,this is the focal length.
 

asd

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Maybe that's part of O level's strategy --- Give easy papers, and move the percentile up so that they don't have to give A/A* grades that often.
 
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Physics, English, Biology all done and dusted! Time sure moves quickly!
All physics paper were piece of cake, I hope everyone scores A*!
Best of luck everyone!
Study for the 2 giants coming up tomorrow people!
Its going to be nothing less than Hell!
 
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Standard Girta jaa raha hai O Levels ka .. seriously

Paper halwa tha ... Jis nay bhi kaha tha kay paper hard aayega .. Thank You .. tmhari wajah say kuch tayyari karli thi mein nay ..

btw NO DISCUSSION OF CONTENT BEFORE 24 HOURS !! PLEASE warna ye thread bhi lock karwa doo gay tum log :\
 
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Who is up for chemistry discussion today ? :p yaar A* say kum nai chahiyee Chemistry mein :( Izzat pe baat aajati hai wahan tu ... Insha Allah we will all get A* .. :)
would u like to start the questions or should i
 
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would u like to start the questions or should i

Aap hi start kar dijiye :) wesay ziyada tar kay jawab aap hi ko denay hongay :D ... btw my Macromolecules and Organic is really really weak .. kaafi training chahiyee unn dono mein .. I don't even remember the name of the Macromolecules in our course! let alone their monomers and linkages! :(
 
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Standard Girta jaa raha hai O Levels ka .. seriously

Paper halwa tha ... Jis nay bhi kaha tha kay paper hard aayega .. Thank You .. tmhari wajah say kuch tayyari karli thi mein nay ..

btw NO DISCUSSION OF CONTENT BEFORE 24 HOURS !! PLEASE warna ye thread bhi lock karwa doo gay tum log :\
yar i have discussed the paper already and all ansers confirmed so i will not need to use it to confirm ans
 
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yar i have discussed the paper already and all ansers confirmed so i will not need to use it to confirm ans

I know jaani .. I am mostly talking to those jo abhi thori dair mein meri post parhnay kay baad bhi discussion start kardeingay :D
 
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Aap hi start kar dijiye :) wesay ziyada tar kay jawab aap hi ko denay hongay :D ... btw my Macromolecules and Organic is really really weak .. kaafi training chahiyee unn dono mein .. I don't even remember the name of the Macromolecules in our course! let alone their monomers and linkages! :(
ok lets start two types of polymers addition(without loss of molecules, high temp and pressure,catalyst) eg teflon(non stick surface of pans, perspex(cars front window) polyethene(plastic bags0 and they are thermosetting plastics so they can be heated and reshaped.
 
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