top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

    Get Free Puzzle Updates

Facebook Login
Site Registration

A convex lens have focal length 30cm at what distance the object must be placed to form an image at 60cm?

0 votes
31 views
A convex lens have focal length 30cm at what distance the object must be placed to form an image at 60cm?
posted Oct 2, 2018 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

Lens formula,
1/v - 1/u = 1/f
where,
v = image distance from lens
u = object distance from lens
f = focal length

here ,
f = 30 cm { for convex lens f is positive }
v = 60cm

1/60 - 1/u = 1/30 -> 1/60 - 1/30 = 1/u -> -1/60 = 1/u -> u = -60 cm
hence, object distance also 60cm but left side of convex lens . in which position of image is right side.

magnification = ( image distance )/(object distance ) = 60/(-60) = -1
it means height of image = height of object . but both lies just opposite sides of lens .

answer Oct 2, 2018 by Hanifa Mammadov



Similar Puzzles
0 votes

An object of mass m = 2 kg is lying on a rough inclined slope such that it is at rest. Find the magnitude of contact force acting on the object (in Newtons).

Assume
g=10
Coefficient of friction = .8
Angle of elevation = 30

+1 vote

If the kinetic friction force acting on a sliding crate has a magnitude of 120N. How much force must be applied to maintain a constant velocity?

+1 vote

If the kinetic friction force acting on a sliding crate has a magnitude of 120N, how much force must be applied to maintain a constant velocity?

0 votes

A simple pendulum with length l and bob of mass m execute simple harmonic motion of small amplitude A. What would be the maximum tension in the string?

+2 votes

Each of these words can have the same letter placed at the beginning and the end to form a new word. What are the new words?

_EVE_
_ABLE_
_CARVE_
_AS_
_ON_
_ODE_
_ELUDE_
_APE_
_ATE_
_ROD_          
Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...