Find the power of a concave lens of focal len | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The focal length of a concave lens is taken as negative by sign convention.Given,focal length $f = -2 \,m$.The power of a lens is defined as the r

Vedclass · Accepted Answer

$-0.5$

Vedclass · Answer

(B) The focal length of a concave lens is taken as negative by sign convention.Given,focal length $f = -2 \,m$.The power of a lens is defined as the reciprocal of its focal length in meters,given by the formula $P = \frac{1}{f 	ext{ (in meters)}}$.Substituting the value: $P = \frac{1}{-2} = -0.5 \,D$.The negative sign indicates that the lens is concave (diverging).Therefore,the power of the given concave lens is $-0.5 \,D$.

Find the power of a concave lens of focal length $2 \,m$ in $Diopter$.

Similar Questions

The radius of curvature of a spherical mirror is $20\, cm$. What is its focal length (in $cm$)?

Find the focal length (in $cm$) of a convex mirror whose radius of curvature is $32\, cm$.

$A$ ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

Name the type of mirror used in the following situation and support your answer with a reason:
$(a)$ Solar furnace

Light enters from air to glass having refractive index $1.50$. What is the speed of light in the glass? The speed of light in vacuum is $3 \times 10^8 \, m \, s^{-1}$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module