KCET · Physics · Wave Optics
A focal length of a lens is \( 10 \mathrm{~cm} \). What is power of a lens in dioptre ?
- A \( 0.1 \mathrm{D} \)
- B \( 10 \mathrm{D} \)
- C \( 15 \) D
- D O \( 20 \) D
Answer & Solution
Correct Answer
(B) \( 10 \mathrm{D} \)
Step-by-step Solution
Detailed explanation
Given, focal length \( =10 \mathrm{~cm}=10 \times 10^{-2}=0.1 \mathrm{~m} \)
Power of lens \( =\frac{1}{f}=\frac{1}{0.1}=1 \) dioptre
Thus, power of lens in dioptre is \( 10 \mathrm{D} \)
Power of lens \( =\frac{1}{f}=\frac{1}{0.1}=1 \) dioptre
Thus, power of lens in dioptre is \( 10 \mathrm{D} \)
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