Question

Define The following
1. Power of lens
2. Diopter
3. spherical lenses
4.Ray diagrams
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Answer 1

Answer:

1.The reciprocal of focus.

Explanation:

Power=1/f

2.Dioptre is unit of power of lens.

3.A transparent thick spherical glass.

4.These are virtual rays used in draw the ray of lens and mirror.