When an object is placed at a distance of 30 cm from a spherical lens, its image is
formed on the wall which is twice the size of the object. At what distance from the lens should the object be placed to obtain a virtual image three times the size of the
object?
Answers
Answered by
1
Answer:
What would you like to ask?
12th
Physics
Ray Optics and Optical Instruments
Combination of Mirror and Lenses
An object is placed at 30c...
PHYSICS
avatar
Asked on December 27, 2019 by
Geeta Tejwani
An object is placed at 30cm from a convex lens and its real image is formed at 20cm away from the lens. Calculate the focal length of convex lens. Draw ray diagram also.
MEDIUM
Share
Save
ANSWER
Here,
Image distance=v=20cm,
Object distance=u=−30cm,
Lens equation is given by,
v
1
−
u
1
=
f
1
,
putting the values we get,
20
1
−
−30
1
=
f
1
,
∴f=12cm
∴ Focal length of convex lens=f=12cm
Explanation:
i hope you understand so like me
Similar questions