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  • If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens ? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, wh

If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, what is the nature of this lens ? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ?

 

 

 

 
 
 
 
 

Answers (1)

Power of lens = 100

The focal length = ?

P=\frac{1}{f}

100=\frac{100}{f}cm

f=\frac{100}{10}

F=10 cm

Nature of lens is concave.

Posted by

Priyanka Kumari

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