Physics, asked by yana85, 1 year ago

Find the focal length of a lens of power -2d. Identify the type of lens

sagar10031: concave lens

Shailesh183816: -0.5

Shailesh183816: And Concave lens

Answers

Answered by dhruvsh

110

Power = 1/Focal length
Focal length = -1/2 m = -0.5 metres = -50 centimetres
So, this Lens is a concave lens, i.e a diverging lens because the focal length is negative.

Hope this helps you !

Shailesh183816: Bhai Power Pahle se hi meter mai

Shailesh183816: -0.5 hogi focal length

dhruvsh: Power toh dioptre me hai na , isliye focal length jo ayegi woh metre me aegi

dhruvsh: dikkat kya ho gayi?

Shailesh183816: Bhai 1Dioptre =1 m so

Shailesh183816: Wo pahle se hi meter mai hai

dhruvsh: 1 Dioptre = 1 per metre hai na

dhruvsh: toh fir focal length bhi metre me hi rahegi na

Answered by rajjbpathan

Answer:

f=-50cm

The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex )lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values

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