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GUJCET · Physics · Ray Optics and Optical Instruments
A lens of power -4.0 Diopter. It means ________ .
- A Concave lens of focal length -25.0 cm
- B Concave lens of focal length -0.25 cm
- C Concave lens of focal length +0.25 cm
- D Concave lens of focal length +25.0 cm
Answer & Solution
Correct Answer
(A) Concave lens of focal length -25.0 cm
Step-by-step Solution
Detailed explanation
(A) Concave lens of focal length -25.0 cm
Power \(\mathrm{P}=\frac{1}{f}\)
\(\therefore \quad f=\frac{1}{\mathrm{P}}\)
\(\therefore \quad f=\frac{1}{-4}\)
\(\therefore \quad f=-0.25 \mathrm{~m}\)
\(\therefore \quad f=-25 \mathrm{~cm}\)
Power \(\mathrm{P}=\frac{1}{f}\)
\(\therefore \quad f=\frac{1}{\mathrm{P}}\)
\(\therefore \quad f=\frac{1}{-4}\)
\(\therefore \quad f=-0.25 \mathrm{~m}\)
\(\therefore \quad f=-25 \mathrm{~cm}\)
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