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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. Fringe width is

A

1 mm

B

0.5 mm

C

1.5 mm

D

0.25 mm

Text Solution

Verified by Experts

The correct Answer is:
B
`beta=(5xx10^(-7)xx50xx10^(-2))/(0.5xx10^(-3))=5xx10^(-4)m=0.5mm`
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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

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

Knowledge Check

  • Radius of curvature of a concave mirror is 20 cm, then its focal length is ...... cm.

    A
    - 20 cm
    B
    + 20 cm
    C
    – 10 cm
    D
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  • A plano-convex lens of radius of curvature 30 cm and refractive index 1.5 is kept in air. Find its focal length (in cm).

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    30
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  • Radius of curvature of plano-convex lens is 10 cm. If its focal length is 30 cm, then its refractive index will be .......

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