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Physics

The lens of power + 1.0 D is:

  1. convex of focal length 1.0 cm
  2. convex of focal length 1.0 m
  3. concave of focal length 1.0 cm
  4. concave of focal length 1.0 m.

Refraction Lens

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Answer

convex of focal length 1.0 m

Reason — As we know that,

P=1fP = \dfrac{1}{f}

Where,

P = power of lens and

f = focal length of lens.

Given,

power = + 1.0 D

Substituting the values in the formula we get,

+1.0 D=(1f) m⇒f=1.0 m+1.0 \text{ D} = \Big(\dfrac{1}{f}\Big)\text{ m} \\[0.5em] \Rightarrow f = 1.0 \text{ m}

Hence, focal length = 1.0 m

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