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# The Power of a Concave Lens is 10 D and that of a Convex Lens is 6 D. When These Two Lenses Are Placed in Contact with Each Other, the Power of Their Combination Will Be : (A) +16 D (B) +4 D (C) −16 D (D) −4 D - CBSE Class 10 - Science

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ConceptRefraction of Light Image Formation by Lenses - Concave Lens

#### Question

The power of a concave lens is 10 D and that of a convex lens is 6 D. When these two lenses are placed in contact with each other, the power of their combination will be :
(a) +16 D
(b) +4 D
(c) −16 D
(d) −4 D

#### Solution

-4 D
The powers of the lenses add up when brought in contact.
So, net power = +6 D + (-10 D) = -4 D.

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#### APPEARS IN

Solution The Power of a Concave Lens is 10 D and that of a Convex Lens is 6 D. When These Two Lenses Are Placed in Contact with Each Other, the Power of Their Combination Will Be : (A) +16 D (B) +4 D (C) −16 D (D) −4 D Concept: Refraction of Light - Image Formation by Lenses - Concave Lens.
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