What is the power of a convex lens of focal length 0.5 m?

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Solution

Power of a lens is given by:
Power (P) = $\frac{1}{f}$

∴ P = $\frac{1}{0.5}$ =2 D.

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Similar questions

The focal length of a convex lens is 25 cm. What is its power ?

The lens of power + 1.0 D is :

(a) convex of focal length 1.0 cm

(b) convex of focal length 1.0 m

(d) concave of focal length 1.0 m

Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
(c) A concave lens has 4 dioptre power having a focal length 0.25 m.
(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

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What is the power of a convex lens of focal length 0.5 m?

​​Power of a lens is given by: Power (P) = 1f ∴ P =10.5=2 D.

Power of a lens is given by:
Power (P) = $\frac{1}{f}$

∴ P = $\frac{1}{0.5}$ =2 D.