Question

find the focal length of concave lens of power-2D

plz ans. this .. ​

Answer 1

Answer:

focal length should be equal to 2 meters.It gone be firm Rafferty power equal to the reciprocal of the focal length is equal to 1 by there it will be equal to minus 1/2 the focal length or a concave lens.

Answer 2

Answer:

-200 cm

Explanation:

power is the reciprocal of the focal length in meters

-2 = 1/f(m)

therefore f = -2 m or -200 cm

since the focal length is negative it is a concave lense