The radii of cui-vature of the faces of a double convex lens are 10 cm and . 20 cm. The refractive index of the glass is 1-5. What is the power of this lens {in units of dioptre) ? .

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Q: 56 (NDA-I/2017)
The radii of cui-vature of the faces of a double convex lens are 10 cm and . 20 cm. The refractive index of the glass is 1-5. What is the power of this lens {in units of dioptre) ? .
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question_subject: 

Maths

question_exam: 

NDA-I

stats: 

0,4,5,4,2,2,1

keywords: 

{'double convex lens': [0, 0, 0, 1], 'refractive index': [0, 1, 1, 5], 'lens': [0, 0, 0, 1], 'glass': [0, 0, 1, 4], 'dioptre': [0, 0, 0, 5], 'cui': [0, 0, 0, 1], 'power': [24, 3, 21, 61], 'units': [1, 2, 4, 7], 'radii': [0, 0, 0, 2], 'cm': [2, 0, 7, 20]}