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In which of the following cases do we ob...

In which of the following cases do we obtain a spherical wave fron ?
a) sunlight focussed by a convex lens
b) light diverging from a straight slit
c) light emitted by a point source in an isotropic medium
d) a parallel beam of light reflected from a plane mirror

A

a, b only

B

b, c only

C

a, d only

D

a, c only

Text Solution

Verified by Experts

The correct Answer is:
D
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What is the shape of the wavefront in each of the following cases ? Light diverging from a point source.

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Knowledge Check

  • Assertion : Wavefronts obtained from light emitted by a point source in an isotropic medium are always spherical. Reason : Speed of light in isotropic medium is constant.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Which of the following is correct for light diverging from a point source ?

    A
    The intensity decreases in proporation for the distance squared.
    B
    The wavefront is parabolic.
    C
    The intensity at the wavelength does not depend on the distance.
    D
    None of these.

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    A narrow slit S transmitting light of wavelength 'lambda' . Is placed at a distance d above a large plane mirror as shown. The light coming directly from the slit and that coming after the reflection interfere at a screen S placed at a distance D from the slit. at what distance from point O, the resultant intensity is maximum ? (there is a phase change of pi of reflection from the mirror)

    M_(1) and M_(2) are two plane mirrors which are kept parallel to each other as shown. There is a point 'O' on perpendicular screen just infront of 'S' . What should be the wavelength of light coming from monchromatic source 'S' . So that a maxima is formed at 'O' due to interference of reflected light from both the mirrors. [Consider only 1st reflection]. [D gt gt d, d gt gt lambda]

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    A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths 15 cm and 5 cm respectively. What is the distance between the two lenses to obtain a parallel beam of light from the concave lens ?

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