Find the focal length of a lens of power -2.0 D. What type of lens is this?
Power of lens, P = \(\frac{1}{f} \)
P = -2D
f = \(\frac{1}{P} \)
f = \(\frac{-1}{2} \) ;

Question

Find the focal length of a lens of power -2.0 D. What type of lens is this?
Power of lens, P = \(\frac{1}{f} \)
P = -2D
f = \(\frac{1}{P} \)
f = \(\frac{-1}{2} \) ;

Accepted Answer

Answer :

f = -0.5 m

The focal length is negative. Hence, it is a concave lens.

The value of the focal length should be written in metres when substituting in the formula:

Find the focal length of a lens of power -2.0 D. What type of lens is this?
Power of lens, P = \(\frac{1}{f} \)
P = -2D
f = \(\frac{1}{P} \)
f = \(\frac{-1}{2} \) ;

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Find the focal length of a lens of power -2.0 D. What type of lens is this? Power of lens, P = \(\frac{1}{f} \) P = -2D f = \(\frac{1}{P} \) f = \(\frac{-1}{2} \) ;

NCERT solutions of related questions for Light Reflection and Refraction

NCERT solutions of related chapters class 10 maths

NCERT solutions of related chapters class 10 science

Find the focal length of a lens of power -2.0 D. What type of lens is this?
Power of lens, P = \(\frac{1}{f} \)
P = -2D
f = \(\frac{1}{P} \)
f = \(\frac{-1}{2} \) ;