Answer:
using the lens formula: 1/f = 1/u + 1/v
focal length f = -30 (negative because it is concave lens)
object distance u = 60
image distance v= unknown
1/-30 = 1/60 + 1/v
v = -20
So, the image is 20cm from lens (on the same side along with the object), and it is virtual (because of negative sign) and erect (concave lens must produce erect images).
Answer:
He could re read his answear.
Explanation:
An educated guess to something you should test over and over
Organize your study space. ...
Use flow charts and diagrams. ...
Practice on old exams. ...
Explain your answers to others. ...
Organize study groups with friends. ...
Take regular breaks. ...
Snack on brain food. ...
Plan your exam day.
Just plain study..
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