Home
Class 12
PHYSICS
In the figure shown S is a point monochr...


In the figure shown S is a point monochromatic light source of frequency `6xx10^(14)Hz`.M is a concave mirror of radius of curvature 20 cm and L is a thin converging lens of focal length 3.75 cm AB is the principal axis of M and L.
Light reflected from the mirror and refracted from the lens in succession reaches the screen. An interference pattern is obtained on the screen by this arrangement.
Q. If the lens is replaced by another converging lens of focal length `(10)/(3)cm` and the lens is shifted towards right by 2.5 cm then

A

fringe width remains same

B

intensity of pattern will remain same

C

fringe width will change

D

No interference pattern will form.

Text Solution

Verified by Experts

The correct Answer is:
D

Image formed by the combination is `I_(2)` at
`(1)/(v)-(1)/(-5)=(3)/(10)impliesv=10cm` it will coincide with S
So no interference pattern on the screen.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • WAVE OPTICS

    ALLEN|Exercise Example 13|1 Videos

  • WAVE OPTICS

    ALLEN|Exercise Example 14|1 Videos

  • WAVE OPTICS

    ALLEN|Exercise Example 11|1 Videos

  • UNIT & DIMENSIONS, BASIC MATHS AND VECTOR

    ALLEN|Exercise Exercise (J-A)|7 Videos

Similar Questions

Explore conceptually related problems

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

A luminous object is placed at a distance of 40 cm from a converging lens of focal length 25 cm. The image obtained in the screen is

Knowledge Check

  • In the figure shown S is a point monochromatic light source of frequency 6xx10^(14)Hz .M is a concave mirror of radius of curvature 20 cm and L is a thin converging lens of focal length 3.75 cm AB is the principal axis of M and L. Light reflected from the mirror and refracted from the lens in succession reaches the screen. An interference pattern is obtained on the screen by this arrangement. Q. Fringe width is

    A
    1 mm
    B
    0.5 mm
    C
    1.5 mm
    D
    0.25 mm

  • In the figure shown S is a point monochromatic light source of frequency 6xx10^(14)Hz .M is a concave mirror of radius of curvature 20 cm and L is a thin converging lens of focal length 3.75 cm AB is the principal axis of M and L. Light reflected from the mirror and refracted from the lens in succession reaches the screen. An interference pattern is obtained on the screen by this arrangement. Q. Distance between two coherent sources whichmakes interference pattern on the screen is

    A
    1 mm
    B
    0.5 mm
    C
    1.5 mm
    D
    0.25 mm

  • A candle is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:

    A
    upright and magnified
    B
    inverted and magnified
    C
    inverted and diminished
    D
    upright and diminished.

    • Similar Questions

    Explore conceptually related problems

    In the figure shown L is a converging lens of foacl length 10 cm and M is a concave mirror of radius of curvature 20 cm . A point object O is placed in front of the lens at a distance 15 cm.AB and CD are optical axes of the lens and mirror repectively. Find the distance of the final image formed by this system from the optical centre of the lens. The distance between CD & AB is 1 cm

    A concave lens of focal length 20 cm is placed 15 cm in front of a concave mirror of radius of curvature 26 cm and further 10 cm away from the lens is placed an object. The principal axis of the lens and the mirror are coincident and the object is on the axis Find the position and nature of the image.

    An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:

    In the figure shown L is converging lens of focal length 10 cm and M is a concave mirror of radius of curvature 20 cm . A point object O is placed in front of the lens at a distance 15 cm . AB and CD are optical axes of the lens mirror respectively. Find the coordinates of the final image formed by this system taking O as origin. The distance between CD & AB is 1mm.

    A point source of light is being moved closer to a thin concave lens from a large distance on its principal axis. Is the radius of curvature of the refracted wave front, close to the lens, increasing or decreasing?

    Home
    Profile