A doctor has advised to use 2.5D lens. The focal length of the lens is ………………….. 

Monjur Alahi

A doctor has advised to use 2.5D lens. The focal length of the lens is ………………….. 

A) 40 cm 

B) 250 cm 

C) 2.5 cm 

D) 50 cm


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Salim Ahmed Kawsar

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Correct option is  A) 40 cm

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