MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Linear Magnification

Radius of cur...

Question

Radius of curvature of a concave lens is 60 cm. What is the focal length?

A

-30

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

-60

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

60

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

30

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A -30
Radius of curvature is twice the focal length for a spherical lens

Therefore the magnitude of the focal length will be 60/2 = 30 cm

As the lens in discussion is a concave one, the sign will be negative

Therefore the correct answer is D, -30 cm.

Suggest Corrections

thumbs-up

7

Similar questions

Q. A plano-convex lens (focal length

\int_{2}

refractive index

μ_{2}

radius of curvature R) fits exactly into a plano-concave lens (focal length

f_{1}

refractive index

μ_{1}

radius of curvature R). Their plane surfaces are parallel to each other. the focal of the will be :

Q. A thin concavo-convex lens has focal length +60 cm. The radius of curvature of concave surface is double that of convex. The radii of curvature of two surfaces, if refractive index of material of lens is 1.4, are

Q. A plane-convex lens has a refractive index of 1.6 and a radius of curvature 60 cm. What is the focal length of the lens?

Q. Radius of curvature of a concave mirror is 25 cm what is its focal length

Q. The radii of curvature of a double concave lens are

30 c m

60 c m

and the refractive index of its glass is

1.5

. Calculate the focal length of the lens.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Lateral Magnification

PHYSICS

Watch in App

explore_more_icon

Explore more

Linear Magnification

Standard X Physics

Join BYJU'S Learning Program

CrossIcon