Biology; Chemistry; Physics: Post your doubts here!

[Laibaaa]

Umm for the rays one, we had to trace the rays back right? I didn't do that but i drew the rays correct, the question asked to complete the 2 rays. I didnt trace them back tho will that be okay?

 

[Fate0]

not 80 ??????????

80-90% ki range hoti hai lol tu 85 par tu aa hi jaye ga.

 

[Lilly2318]

HEy Guyz . who hv problem in summary writing including me http://www.olevelpakistan.com/2012/09/149/. Its a useful website of my teacher/sadly she left

 

[Fate0]

Umm for the rays one, we had to trace the rays back right? I didn't do that but i drew the rays correct, the question asked to complete the 2 rays. I didnt trace them back tho will that be okay?

You had to mark f, 2.8 cm away from lens. First ray passes through it while second goes undeviated.

 

[Muhammad_Hamza]

Please help me out...

 

[Laibaaa]

I did thaat. But I didnt trace the ray back to form the image. I made the rays correct tho. And what were the 3 words?

You had to mark f, 2.8 cm away from lens. First ray passes through it while second goes undeviated.

 

[Bathus]

What was the answer of the MCQ with manometer and atmospheric pressure increasing/decreasing, what happens to 'h'

 

[Lilly2318]

I did thaat. But I didnt trace the ray back to form the image. I made the rays correct tho. And what were the 3 words?

inverted, real, magnified

 

[asadalam]

Umm for the rays one, we had to trace the rays back right? I didn't do that but i drew the rays correct, the question asked to complete the 2 rays. I didnt trace them back tho will that be okay?

No the rays did NOT diverge as object was betweem f and 2f so the image would be formed at some distance.The question also stated that image would be formed after 11 cm,and this was true as the lines got closer but did not meet before 11 cm.They were not parallel so at some point the were bound to meet on the opposite side of the lens

 

[Lilly2318]

What was the answer of the MCQ with manometer and atmospheric pressure increasing/decreasing, what happens to 'h'

i wrote as atmospheric press dec, mercury incrss

 

[Faizan Muhammmad]

No the rays did NOT diverge as object was betweem f and 2f so the image would be formed at some distance.The question also stated that image would be formed after 11 cm,and this was true as the lines got closer but did not meet before 11 cm.They were not parallel so at some point the were bound to meet on the opposite side of the lens

her post gave me a heart attack for a moment

 

[Fate0]

I did thaat. But I didnt trace the ray back to form the image. I made the rays correct tho. And what were the 3 words?

Real Inverted and magnified as the object was between f and 2f.

What was the answer of the MCQ with manometer and atmospheric pressure increasing/decreasing, what happens to 'h'

(A) It decreases with as atmospheric pressure decreases with height. As atmospheric pressure decreases there was less pressure acting on the open end. Thus the liquid would move up.

 

[Lilly2318]

No the rays did NOT diverge as object was betweem f and 2f so the image would be formed at some distance.The question also stated that image would be formed after 11 cm,and this was true as the lines got closer but did not meet before 11 cm.They were not parallel so at some point the were bound to meet on the opposite side of the lens

hahaha ye diagram kitnai marks ki thi. mai tou gayi . i think i only did last part right? 7 marks gone down the drain

 

[asadalam]

i wrote as atmospheric press dec, mercury incrss

NO h decreases as atm pressure falls and the distance between highest and lowest decreases.It would not increase h.

 

[Lilly2318]

Real Inverted and magnified as the object was between f and 2f.



(A) It decreases with as atmospheric pressure decreases with height. As atmospheric pressure decreases there was less pressure acting on the open end. Thus the liquid would move up.

wasnt it abt lenght of mercury? i did as atm press dec it increases as leess atmospherric pressure actiong on it

 

[asadalam]

Real Inverted and magnified as the object was between f and 2f.



(A) It decreases with as atmospheric pressure decreases with height. As atmospheric pressure decreases there was less pressure acting on the open end. Thus the liquid would move up.

It would not move up yar,there would be less difference in pressure at both ends and that would lead to lower h.

 

[Laibaaa]

i wrote as atmospheric press dec, mercury incrss

I wrote A, both increase.

 

[Lilly2318]

It would not move up yar,there would be less difference in pressure at both ends and that would lead to lower h.

majority is authority! (Y). still hoping for A. InshaAllah

 

[Fate0]

It would not move up yar,there would be less difference in pressure at both ends and that would lead to lower h.

That is what i said. H would decrease. :|

 

[Bathus]

That's good, I also wrote 'h' decreases as atm pressure decreases with height