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A Doctor Has Prescribed a Corrective Lens of Power, −1.5 D. Find the Focal Length of the Lens. is the Prescribed Lens Diverging Or Converging? - Science

A doctor has prescribed a corrective lens of power, −1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging? 

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Solution

 Power of a lens is given by:  

 Power (P) =`1/f` 

`f=1/f` 

⇒`f=1/-1.5` 

∴ f=-66.67 cm 

Since the power is negative, the lens is of a diverging nature. Therefore, it's a concave lens. 

  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 5 Refraction of Light
Q 19 | Page 261
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