Find the focal length of a lens of power -2-0-D- What of lens is this-

Question

Toppr Admin · Accepted Answer

Given-xA0-xA0-lens of power P-x2212-2-0-DPower- P-1f-xA0- -xA0- -xA0- -xA0- -xA0- -xA0-xA0-xA0-f-1p-xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -1-x2212-2-xA0-xA0- -xA0- -xA0- -xA0- -xA0- -xA0- -xA0-f-x2212-0-5-xA0-mSince focal length is negative- it is concave lens-

Find the focal length of a lens of power (-2.0)D. What type of lens is this?

Given, lens of power $P = (- 2.0) D$
Power, $P = \frac{1}{f}$

$f = \frac{1}{p}$

$= \frac{1}{- 2}$

$f = - 0.5 m$

Since focal length is negative, it is concave lens.

Find the focal length of a lens of power (-2.0)D. What type of lens is this?

Given, lens of power P=(−2.0)DPower, P=1f f=1p =1−2 f=−0.5 mSince focal length is negative, it is concave lens.

Given, lens of power $P = (- 2.0) D$
Power, $P = \frac{1}{f}$

$f = \frac{1}{p}$

$= \frac{1}{- 2}$

$f = - 0.5 m$

Since focal length is negative, it is concave lens.