Home
Class 12
PHYSICS
The focal length of a convex lens is 30c...

The focal length of a convex lens is `30cm` and the size of the real image is `(1)/(4)th` of the object. Then the object distance is

A

`150cm`

B

`90cm`

C

`60cm`

D

`30cm`

Text Solution

Verified by Experts

The correct Answer is:
A
`(v)/(u)=(1)/(4)impliesu=4v` and `(1)/(u)+(1)/(v)implies(1)/(f)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • EXPERIMENTAL PHYSICS

    NARAYNA|Exercise Level-v(Single answer)|23 Videos

  • EXPERIMENTAL PHYSICS

    NARAYNA|Exercise Multiple answer|6 Videos

  • ELECTROSTATICS AND GAUSS LAW

    NARAYNA|Exercise Intergers type question|11 Videos

  • MAGNETISM

    NARAYNA|Exercise LEVEL-II (H.W)|24 Videos

Similar Questions

Explore conceptually related problems

An object is placed in front of a convex lens of focal length 12 cm. If the size of the real image formed is half the size of the object, calculate the distance of the object from the lens.

The focal length of a convex lens is 20 cm . If an object of height 4 cm is placed at 30 cm from the lens , find the position, nature and size of the image .

Knowledge Check

  • The focal length of a convex lens is 18 cm and the size of the image is a quarter of the object. The object is situated at a distance of

    A
    90 cm
    B
    54 cm
    C
    22.5 cm
    D
    60 cm

  • The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

    A
    150 cm
    B
    60 cm
    C
    30 cm
    D
    40 cm

  • A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance?

    A
    36cm
    B
    25cm
    C
    30cm
    D
    150cm

    • Similar Questions

    Explore conceptually related problems

    A convex lens of focal length 16 cm forms a real image double the size of the object. The image distance of the object from the lens is

    The focal length of convex tens is f and the distance of an object from the principal focus is x. The ratio of the size of the real image to the size of the object is

    An object is placed in front of a thin convex lens of focal length 30cm and a plane mirror is placed 15cm behind the lens.If the final image of the object coincides with the object the distance of the object from the lens is

    The distance between the object and its real image from the convex lens is 60 cm and the height of image is two times the height of object . The focal length of the lens is

    A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is

    Home
    Profile