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# AS Biology calculation (Cells) watch

1. will upload in a min
2. (Original post by Qer)
Use the bar to figure out how many cm in 50 micrometres, then how many cm in 1 micrometre. Then measure from G to H, multiply the number of cm from G to H by the amount of micrometres in 1 cm.
3. (Original post by Mikasadoge)
Use the bar to figure out how many cm in 50 micrometres, then how many cm in 1 micrometre. Then measure from G to H, multiply the number of cm from G to H by the amount of micrometres in 1 cm.
thanks got right answer.

if we have to find image length of above example then what will we do?
4. (Original post by Qer)
thanks got right answer.

if we have to find image length of above example then what will we do?
Same thing, measure in cm, then convert using your knowledge of how many micrometres per cm.
5. (Original post by Mikasadoge)
Same thing, measure in cm, then convert using your knowledge of how many micrometres per cm.
just need clarification

if we want to find the magnification
= image length /actual length

image length =will be the length of bar (1600 micrometre)
and actual length will be 50micrometer
??
6. (Original post by Qer)
just need clarification

if we want to find the magnification
= image length /actual length

image length =will be the length of bar (16 micrometre)
and actual length will be 50micrometer
??
Yep, Mag=Image/Actual

what's the length of the bar and Image in cm?
7. (Original post by Mikasadoge)
Yep, Mag=Image/Actual

what's the length of the bar and Image in cm?
length of bar =1.6 cm
image =6.4cm
8. (Original post by Qer)
length of bar =1.6 cm
image =6.4cm
so 1.6 cm = 50 micrometres, 50/1.6 is the amount of micrometres per cm.

to get the actual image size do 6.4*(50/1.6). This is just multiplying the length of the image by the amount of micrometres per cm
9. (Original post by Mikasadoge)
so 1.6 cm = 50 micrometres, 50/1.6 is the amount of micrometres per cm.

to get the actual image size do 6.4*(50/1.6). This is just multiplying the length of the image by the amount of micrometres per cm
is the distance and image size are same thing ?
10. (Original post by Qer)
is the distance and image size are same thing ?
I was assuming that you meant the distance from G to H. What do you mean by image size?
11. (Original post by Mikasadoge)
I was assuming that you meant the distance from G to H. What do you mean by image size?

yeah from G to H

basically, I have two examples in front of me.

the first example is that I posted before in which we have to find the distance.

In the second example, we have given mitochondria and bar which has length 2.4 cm and 65um written
with the bar and we have to work on Magnification

In mark scheme, they say divide the length of the bar with 65.so according to formula mag =image /actual length ...image length will be 2.4cm ....?

in example one that I posted
we have given bar so my question is then the image length will be the length of bar which is 1.6??
12. (Original post by Qer)
yeah from G to H

basically, I have two examples in front of me.

the first example is that I posted before in which we have to find the distance.

In the second example, we have given mitochondria and bar which has length 2.4 cm and 65um written
with the bar and we have to work on Magnification

In mark scheme, they say divide the length of the bar with 65.so according to formula mag =image /actual length ...image length will be 2.4cm ....?

in example one that I posted
we have given bar so my question is then the image length will be the length of bar which is 1.6??
M=A/I so M=0.024/0.0000065

in the example you posted the image length would be the length of the image, assuming the "image" is the leaf.

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