Question

10 dioptre find focal length

Answer 1

Answer:

10 cm or 0.1 m

Step-by-step explanation:

Power ( in diopters ) = 1 / Focal Length ( in meters )

⇒ 10 D = 1 / Focal Length

⇒ Focal Length = 1 / 10 D

⇒ Focal Length = 0.1 m = 10 cm

Hence Focal Length is 10 cm.

Answer 2

Power = 10 D

focal length = f

We know that

P = 1/f

=> 10 = 1/f

=> f = 0.1m

=> f = 10cm

Thus focal length is 10cm. Since focal length is positive, it is a convex lens.