WorksheetsPHYSICS CLASS WORK
Total questions: 15
Worksheet time: 22mins
To calculate magnification of an electron micrograph we use......
magnification = image size x actual size
magnification = image size ÷ actual size
magnification = actual size ÷ field of view
magnification = eyepiece lens x objective lens
To calculate the image size of an electron micrograph if we use.....
Image size = Actual size x Magnification
Image size = Magnification ÷ Actual size
Image size = Actual size ÷ magnification
Image size = Magnification x Actual size
Josie measured the scale bar image to be 80 mm. What is the Magnification of this electron micrograph?
I = AM
160X
0.00625 X
0.16X
25,000X
If the scale bar measures 60 mm and the actual size it represents is 30 μm , what is the magnification?
20X
5,000X
150X
2,000X
If a scale bar measures 32 mm and it states it's length is 100 μm, what is the magnification?
0.32 x
3,200 x
320 x
32,000 x
If a bacteria image measures 450 mm and the magnification is 15,000x, what is the actual size of the bacteria?
30 µm
0.3 µm
300 µm
3,000 µm
Serena measured the image of one of the bacterial cells to be 32 mm. If the magnification of the image is 8,000X, what is the actual size of the bacterial cell?
4 μm
0.004 μm
256,000 μm
0.25 μm
What steps should Burt follow to calculate the actual size of each bacterial cell?
Step 1: Measure the image of the bacterial cell
Step 2: Divide the image size by the scale bar size
Step 1: Calculate the magnification by measuring the scale bar image x actual size
Step 2: Measure image of bacterial cell ÷ magnification
Step 1: Calculate the magnification by measuring the scale bar image ÷ actual size
Step 2: Measure image of bacterial cell ÷ magnification
He can't, it is impossible to calculate
An object is placed 20 cm at the left side of a biconcave lens with focal length of 12 cm. Find the position of the image formed.
7.5 cm
-30 cm
30 cm
-7.5 cm
State the characteristic of image foremd
real, upright and diminished
real, inverted and diminished
virtual, upright and magnified
virtual, upright and diminished
Calculate the focal length when given u=15cm and a virtual image at 25 cm is formed. State the type of lens used.
37.5 cm (biconcave lens)
-37.5 cm (biconcave lens)
37.5 cm (biconvex lens)
9.4 cm (biconvex lens)
What is the formula for magnification?
-v / u
-hi / ho
hi / ho
v/u
Magnification produced by concave lens is always ______
> 1
< 1
≥1
=1
To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 10.20 m?
0.13 m
0.25 m
0.28 m
0.50 m
An object is placed 5.6 x 10-4 m in front of a converging lens of focal length 1.0 x 10-2 m. The image formed is
real, erect and magnified.
virtual, erect and magnified.
real, inverted and magnified.
virtual, erect and diminished.
