The Power of a Lens is - 4.0 D, then it Means that the Lens is a - Bzziii.com

If the power of a lens is - 4.0 D, then it means that the lens is a 

A. concave lens of focal length -50 m 

B. convex lens of focal length +50 cm 

C. concave lens of focal length -25 cm 

D. convex lens of focal length -25 m

C. concave lens of focal length -25 cm 

Explanation:

P = -4D

P = `"100"/"f(cm)"`

f(cm) = `"100"/"P"`

`"100"/"-4"` = -25 cm.

---

37 38 39 40 41

CBSE Class 10 Science Sample Paper-2022