Question

the focal length of a lens is + 0.50m the power of the lens and type are 1) +2.0D and convex lens 2) +0.2D concave lens 3) -2.0D and concave lens 4) -2.0D and convex lens​

Answer 1

Answer:

+2.0D and it is a concave lens

Answer 2

Given info : The focal length of a lens is +0.5 m.

To find : The power of the lens and type are .m

solution : focal length of a lens is + 0.5 cm (positive)

we know, focal length of convex lens is positive.

so, lens is convex.

now, power of lens = 1/focal length in metre

= 1/(0.5m)

= 2 m¯¹

= +2 Dioptre

Therefore the power of lens is +2D and convex lens.

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