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Ray Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
Question
A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away(a) Concave lens of 20 cm focal length  (b) Convex lens of 20 cm focal length  (c) Concave lens of 12 cm focal length  (d) Convex lens of 12 cm focal length 
   
   
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Answer

(a) Concave lens of 20 cm focal length  

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