Home
Class 12
PHYSICS
An object is placed at the focus of conc...

An object is placed at the focus of concave lens having focal length /. What is the magnification and distance of the image from the optical centre of the lens ?

A

`(1)/(4), (f)/(4)`

B

`(1)/(2),(f)/(2)`

C

Very High `oo`

D

`1, oo`

Text Solution

Verified by Experts

The correct Answer is:
B
`(1)/(F) = (1)/(v) - (1)/(u)`
Put u = - f F = - f
`(1)/(-f) = (1)/(v) - (1)/(-f) , (-1)/( f) = (1)/(f) - (1)/(v) , (-2)/(1) = (1)/(v) rArr v = - (f)/(2)`
Magnification ` = v//u = (-f )/(2 (-f)) = (1)/(2)`
Promotional Banner

Similar Questions

Explore conceptually related problems

An object is placed at the focus of a concave lens. Where will be image ?

An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Find the position and nature of the image.

An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm . Find the nature and position of the image.

An object is placed at a distance of 50cm from a concave lens of focal length 20cm. Find the nature and position of the image.

An object is placed at a distance f in front of a concave lens of focal length f. Locate its image.

An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm. Position, nature and size of the image formed.

An object is placed at 10 cm from a convex lens of focal length 12 cm. Find the position, nature and magnification of the image.

An object 2 cm tall is placed on the axis of a convex lens of focal length 5 cm at a distance of 10 m from the optical center of the lens. Find the nature, position and size of the image formed. Which case of image formation three times. Find the distance of the lens from the filament and the focal length of the lens.