OCR MEI C4 Mathematics June 2016 - Official Thread

Some answers I got

1)Root10cos(theta+1.249)
Invalid because4/root10 is bigger than 1
2)P=2,Q=-2
3)Theta=90,26.565
4)volume=16Pie/3
6)Area was 8
7)Length 5root2
-Q(12/5,8/5,2)
Ratio 3:2
8)Constant of proportionality was 1/4
and k=0.811

Not sure about any others? They were mainly show thats werent they?

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Wouldnt it be 80 found it too small?
The larger the focal length, the smaller the field of view and thus images appear larger.
So for those above 80mm will prefer a larger image and will therefore think it looks too small, whilst those beneath 70 will be used to a larger field of view, so 75mm will look too large?

I got the ratio as 2:3 from 2root2:3root2

Wouldnt it be <70 found it too large?
and >80 found it too small?
The larger the focal length, the smaller the field of view and thus images appear larger.
So for those above 80mm will prefer a larger image and will therefore think it looks too small, whilst those beneath 70 will be used to a larger field of view, so 75mm will look too large?

With a smaller FOV, the image is larger. Therefore those who initially preferred 50 and 60mm, they prefer larger images. Using a 75 mm focal length will decrease the size of the image, therefore they think it is too small.

wtf was 5)ii please enlighten me

With a smaller FOV, the image is larger. Therefore those who initially preferred 50 and 60mm, they prefer larger images. Using a 75 mm focal length will decrease the size of the image, therefore they think it is too small.

Yeah, that must have been what we both meant. I went over the logic a good 10 times in the exam, so I'd be surprised if I got it wrong

You mean an A*?

When you handle an actual camera with varying focal lengths, as you increase the focal length (50 -> 70), the image becomes a lot more zoomed in, and if you reduce it (50 -> 35) the image zooms out, and you get a wider field of view, and thus things appear smaller. In the survey, those who preferred the lower focal lengths will say that the image is too large because the image at 75mm will be much more zoomed in and therefore the wind turbine will become larger. Those who preferred the higher focal lengths will have found the field of view to have widened and the turbine to become smaller and thus will think that the image is too small.