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प्रश्न
Name the types of lenses.
आकृती
उत्तर
There are two types of lenses:
(i) A concave or diverging lens which may be either double-concave, piano-concave or convexo-concave.
(ii) A convex or converging lens which may be either double convex, piano-convex, or concavo-convex.
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