You are Here: Home >< GCSEs

# Biology Homework-Magnification Watch

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.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 13, 2016
Today on TSR

### Last-minute PS help

100s of personal statements examples here

### More pressure for kinky sex?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

## Study tools

### Essay expert

Learn to write like a pro with our ultimate essay guide.

See where you can apply with our uni match tool

### Make study resources

Create all the resources you need to get the grades.

### Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

### Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

### Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.