Home
Class 10
PHYSICS
A parallel beam of light passes through ...

A parallel beam of light passes through a lens held at O as shown in Fig. What is the nature of the lens?

Text Solution

Verified by Experts

The lens at O must be concave as the beam is diverging on passing through the lens.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • REFLECTION AND REFRACTION

    PRADEEP|Exercise Short Q/A (3 marks)|35 Videos

  • REFLECTION AND REFRACTION

    PRADEEP|Exercise long Q/A|7 Videos

  • REFLECTION AND REFRACTION

    PRADEEP|Exercise long answer question|9 Videos

  • MAGNETIC EFFECTS OF ELECTRIC CURRENT

    PRADEEP|Exercise Mock Test|21 Videos

  • SOURCES OF ENERGY

    PRADEEP|Exercise Mock Test|20 Videos

Similar Questions

Explore conceptually related problems

Things always look small on viewing through a lens. What is the nature of the lens?

A convex lens of focal length 1 meter and a concave lens fo focal length 0.25 meter and kept 0.75 meter apart. A parallel beam of light first passes through the ocnvex lens, then through the concave lens and comes to a focus 0.5m away from the concave lens.

Knowledge Check

  • The power of a lens is -4.0 D. what is the nature of the lens?

    A
    Plane
    B
    Concave
    C
    Convex
    D
    Plano convex

  • If parallel beam of light falls on a convex lens. The path of the rays is shown in fig. It follows that

    A
    `mu_(1)gtmugtmu_(2)`
    B
    `mu_(1)ltmultmu_(2)`
    C
    `mu_(1)=multmu_(2)`
    D
    `mu_(1)=mugtmu_(2)`

  • If a convergent beam of light passes through a diverging lens, the result

    A
    may be a convergent beam
    B
    may be a divergent beam
    C
    may be a parallel beam
    D
    must be a parallel beam

    • Similar Questions

    Explore conceptually related problems

    A convex lens of focal length 1 meter and a concave lens of focal length 0.25 meter are kept 0.75 meter apart. A parallel beam of light first passes throught the convex lens, then through the concave lens and comes to a focus 0.5 m away from the the concave lens.

    A horizontal parallel beam of light passes through a vertical convex lens of focal length f. The optical centre of the lens is P. A small plane mirror is placed at point M inclined at 60° to the axis of the lens. Distance PM = f//2 . The mirror reflects the light passing through the lens and forms an image at point I. Find distance PI.

    A parallel beam of light passes parallel to the principal axis and falls on one face of a thin convex lens offocal length f and after two internal reflections from the second face forms a real image. The distance of image from lens if the reflactive index of material of lens is 1.5 :

    A horizontal parallel beam of light passes though a vertical convex lens of focal length 40 cm. Behind the lens there is a plane mirror making an angle theta with the principal axis of the lens. The mirror intersects the principal axis at M. Distance between the optical centre of the lens and point M is OM = 20 cm . The light beam reflected by the mirror converges at a point P. Distance OP is 20 cm. Find theta .

    If a convergent beam of light passes through a diverging lens, the result

    Home
    Profile