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Lenses Grade 8
Test Description: Lenses for grade 8 physics
Instructions: Answer all questions to get your test result.
1) Any incident ray on a converging lens emerges :
A
away from the optical axis
B
toward the optical axis
C
continues without any deviation
D
None of the choices
2) Any Incident ray on a diverging lens emerges:
A
toward the optical axis
B
None of the choices
C
away from the optical axis
D
continues without any deviation
3) Converging lens is a lens that is:
A
thick at the edges and the middle
B
thin at the edges and thick at the middle
C
thick at the edges and thin at the middle
D
thin at the edges and middle
4) Diverging lens is a lens that is:
A
thick at the edges and thin at the middle
B
thin at the edges and thick at the middle
C
thin at the edges and middle
D
thick at the edges and the middle
5) When the emergent ray leaves the lens away from the optical axis, then the lens is:
A
converging lens
B
diverging lens
C
all of the above
D
None of the choices
6) When the emergent ray leaves the lens toward the optical axis, then the lens is:
A
all of the above
B
None of the above choices
C
diverging lens
D
converging lens
7) The symbol of the object focus is:
A
F
B
O
C
None of the above choices
D
F'
8) The image focus F’ is the image of object focus F with respect to:
A
optical center O
B
image focus
C
optical axis
D
object focus F
9) When the incident ray is at the same side of the image focus F’, then the lens is:
A
None of the above choices
B
diverging lens
C
converging lens
D
All of the above
10) When the source of light is at the same side of the object focus F, then the lens is:
A
All of the above
B
diverging lens
C
None of the above choices
D
converging lens
*select an answer for all questions
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