Wave Optics

Physics
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A: In interference pattern, intensity of successive fringes due to achromatic light is not same. 
R: In interference, only redistribution of energy takes place.

A
Both A and R are true, and R is correct explanation of A
B
Both A and R are true, and R is not correct explanation of A
C
A is true but R is false
D
A is false but R is true
Easy
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A wavefront is an imaginary surface where :

A
phase is same for all points
B
phase changes at constant rate at all points along the surface
C
constant phase difference continuously changes between the points
D
phase changes all over the surface
Easy
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A : The phase difference between any two points on a wave front is zero
R : From the source light, reaches every point on the wave front in the same time.

A
Both A and R are true, and R is correct explanation of A
B
Both A and R are true, and R is not correct explanation of A
C
A is true but R is false
D
A is false but R is true
Easy
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A plane wave front falls on a convex lens. The emergent wave front:

A
converges to a point
B
diverges from a point
C
does not suffer any refraction
D
may or may not converge at point
Easy
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Huygens' wave theory is used :

A
to determine the velocity of light
B
to find the position of the wave front
C
to determine the wavelength of light
D
to find the focal length of a lens
Easy
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A plane wave front falls on a convex lens. The emergent wave front is :

A
plane
B
cylindrical
C
spherical diverging
D
spherical converging
Easy
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1: Primary waves can travel in all directions in an ether
2: Secondary waves can travel only in backward in an ether

A
1 is true, 2 is false
B
Both 1 and 2 are true
C
1 is false, 2 is true
D
Both 1 and 2 are false
Easy
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In the set up shown, the two slits and are not equidistant from the slit S. The central fringe at O is then

A
always bright
B
always dark
C
either dark or bright depending on the position of S
D
neither dark nor bright
Easy
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When petrol drops from a vehicle fall over rain water on road surface, colours are seen because of:

A
dispersion of light
B
interference of light
C
scattering of light
D
absorption of light
Easy
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