Question
What is a lens? Write the differences between concave and convex lenses. [5 MARKS]
Answer:
:
Lens : 1 Mark
Differences : 4 Marks
Lenses are pieces of transparent material bound by curved surfaces. Lenses are of two types:
(i)Concave and (ii)convex lens
Convex lens:
1) It is thick at the centre and thinner at edges.
2) It is called converging lens.
Concave lens:
1) It is thin at the centre and thicker at edges.
2) It is called diverging lens.
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:
Lens : 1 Mark
Differences : 4 Marks
Lenses are pieces of transparent material bound by curved surfaces. Lenses are of two types:
(i)Concave and (ii)convex lens
Convex lens:
1) It is thick at the centre and thinner at edges.
2) It is called converging lens.
Concave lens:
1) It is thin at the centre and thicker at edges.
2) It is called diverging lens.
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