Two Thin Lenses Have Powers P₁ and P₂,measured in Diopters

question 19

Multiple Choice

Two thin lenses have powers P₁ and P₂,measured in diopters.If these lenses are placed in contact with one another,the resulting power is

• A)more than both P₁ and P₂.
• B)less than both P₁ and P₂.
• C)half-way between P₁ and P₂.
• D)P₁ + P₂.

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