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# Biology Homework-Magnification

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1. Hello! I'm new to TSR and this is my first proper post. I'd like to ask a question about my biology homework. The question is as follows:
A student views a cheek cell through a microscope. Look at the photo support (just a picture of cheek cells) to see what the student observed.
a)Calculate the magnification when 1cm=1 micrometre
b)Deduce the size of a cheek cell.
Please help, this is urgent! I understand that magnification=size of image/size of real object however all I have is the size of the image, which is 3cm!!
2. You have the magnification.
3. (Original post by B_9710)
You have the magnification.
I need the size of the real specimen in order to calculate the magnification, because size of image/size of real specimen will give me the magnification. With only one measurement I cannot work this out
4. (Original post by MartynaJP6)
I need the size of the real specimen in order to calculate the magnification, because size of image/size of real specimen will give me the magnification. With only one measurement I cannot work this out
Yes but you do have the magnification.
5. (Original post by B_9710)
Yes but you do have the magnification.
I don't understand how, the magnification is not stated
6. (Original post by MartynaJP6)
I don't understand how, the magnification is not stated
1cm is 1μm.
7. (Original post by B_9710)
1cm is 1μm.
Yes I know, so I measured the cell with a ruler, and the measurement is 3cm. In micrometres this is 30micrometres. That is the size of the image, what about the actual specimen? The magnification is always a number without any units.
8. (Original post by MartynaJP6)
Yes I know, so I measured the cell with a ruler, and the measurement is 3cm. In micrometres this is 30micrometres. That is the size of the image, what about the actual specimen? The magnification is always a number without any units.
The magnification is 10^7.
9. (Original post by B_9710)
The magnification is 10^7.
Okay, thanks a lot.
10. (Original post by MartynaJP6)
Okay, thanks a lot.
Do you know why the magnification is 10^7.
11. (Original post by B_9710)
Do you know why the magnification is 10^7.
I'm not too sure but will ask my teacher about it. Thanks anyway.

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