367948
Light emerges out of a convex lens when a source of light kept at its focus. The shape of the wavefront of the light is
1 Plane
2 cylindrical
3 both spherical an cylindrical
4 spherical
Explanation:
The shape of the wavefront when light emerges out of a convex lens when a point source is placed at its focus is plane wavefront, as after refraction, the incident rays become paraxial and wave is always perpendicular to direction of propagation. So, option (1) is correct.
JEE - 2024
PHXII10:WAVE OPTICS
367949
Ray diverging from a point source to form a wave front having the shape
1 Plane
2 Cubical
3 Spherical
4 Cylindrical
Explanation:
PHXII10:WAVE OPTICS
367950
For light diverging from a point source
1 The intensity at the wave front does not depend on the distance
2 The wavefront is parabolic
3 The wavefront is plane
4 The intensity dereasing in proportion to the distance squared
Explanation:
For light diverging from a point source, the wavefront is sphericaal in shape. The intensity varies inversely \(\left( {I\alpha \frac{1}{{4\pi {r^2}}}} \right)\) i.e., intensity decreases in proportion to the distance squared.
NCERT Exemplar
PHXII10:WAVE OPTICS
367951
Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wavefronts, immediately after reflection?
1 They will become plane wave fronts
2 They will remain spherical with the same curvature, both in magnitude and sign
3 They will remain spherical, but with different curvature, and different sign
4 They will remain spherical, with the same curvature, but sign of curvature reversed
Explanation:
If we consider a point source infront of a plane mirror then the waves coming from the source are spherical in shape. A virtual point image will be formed. The reflected waves also will be spherical having same curvature but moving in opposite direction.
367948
Light emerges out of a convex lens when a source of light kept at its focus. The shape of the wavefront of the light is
1 Plane
2 cylindrical
3 both spherical an cylindrical
4 spherical
Explanation:
The shape of the wavefront when light emerges out of a convex lens when a point source is placed at its focus is plane wavefront, as after refraction, the incident rays become paraxial and wave is always perpendicular to direction of propagation. So, option (1) is correct.
JEE - 2024
PHXII10:WAVE OPTICS
367949
Ray diverging from a point source to form a wave front having the shape
1 Plane
2 Cubical
3 Spherical
4 Cylindrical
Explanation:
PHXII10:WAVE OPTICS
367950
For light diverging from a point source
1 The intensity at the wave front does not depend on the distance
2 The wavefront is parabolic
3 The wavefront is plane
4 The intensity dereasing in proportion to the distance squared
Explanation:
For light diverging from a point source, the wavefront is sphericaal in shape. The intensity varies inversely \(\left( {I\alpha \frac{1}{{4\pi {r^2}}}} \right)\) i.e., intensity decreases in proportion to the distance squared.
NCERT Exemplar
PHXII10:WAVE OPTICS
367951
Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wavefronts, immediately after reflection?
1 They will become plane wave fronts
2 They will remain spherical with the same curvature, both in magnitude and sign
3 They will remain spherical, but with different curvature, and different sign
4 They will remain spherical, with the same curvature, but sign of curvature reversed
Explanation:
If we consider a point source infront of a plane mirror then the waves coming from the source are spherical in shape. A virtual point image will be formed. The reflected waves also will be spherical having same curvature but moving in opposite direction.
367948
Light emerges out of a convex lens when a source of light kept at its focus. The shape of the wavefront of the light is
1 Plane
2 cylindrical
3 both spherical an cylindrical
4 spherical
Explanation:
The shape of the wavefront when light emerges out of a convex lens when a point source is placed at its focus is plane wavefront, as after refraction, the incident rays become paraxial and wave is always perpendicular to direction of propagation. So, option (1) is correct.
JEE - 2024
PHXII10:WAVE OPTICS
367949
Ray diverging from a point source to form a wave front having the shape
1 Plane
2 Cubical
3 Spherical
4 Cylindrical
Explanation:
PHXII10:WAVE OPTICS
367950
For light diverging from a point source
1 The intensity at the wave front does not depend on the distance
2 The wavefront is parabolic
3 The wavefront is plane
4 The intensity dereasing in proportion to the distance squared
Explanation:
For light diverging from a point source, the wavefront is sphericaal in shape. The intensity varies inversely \(\left( {I\alpha \frac{1}{{4\pi {r^2}}}} \right)\) i.e., intensity decreases in proportion to the distance squared.
NCERT Exemplar
PHXII10:WAVE OPTICS
367951
Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wavefronts, immediately after reflection?
1 They will become plane wave fronts
2 They will remain spherical with the same curvature, both in magnitude and sign
3 They will remain spherical, but with different curvature, and different sign
4 They will remain spherical, with the same curvature, but sign of curvature reversed
Explanation:
If we consider a point source infront of a plane mirror then the waves coming from the source are spherical in shape. A virtual point image will be formed. The reflected waves also will be spherical having same curvature but moving in opposite direction.
367948
Light emerges out of a convex lens when a source of light kept at its focus. The shape of the wavefront of the light is
1 Plane
2 cylindrical
3 both spherical an cylindrical
4 spherical
Explanation:
The shape of the wavefront when light emerges out of a convex lens when a point source is placed at its focus is plane wavefront, as after refraction, the incident rays become paraxial and wave is always perpendicular to direction of propagation. So, option (1) is correct.
JEE - 2024
PHXII10:WAVE OPTICS
367949
Ray diverging from a point source to form a wave front having the shape
1 Plane
2 Cubical
3 Spherical
4 Cylindrical
Explanation:
PHXII10:WAVE OPTICS
367950
For light diverging from a point source
1 The intensity at the wave front does not depend on the distance
2 The wavefront is parabolic
3 The wavefront is plane
4 The intensity dereasing in proportion to the distance squared
Explanation:
For light diverging from a point source, the wavefront is sphericaal in shape. The intensity varies inversely \(\left( {I\alpha \frac{1}{{4\pi {r^2}}}} \right)\) i.e., intensity decreases in proportion to the distance squared.
NCERT Exemplar
PHXII10:WAVE OPTICS
367951
Spherical wavefronts, emanating from a point source, strike a plane reflecting surface. What will happen to these wavefronts, immediately after reflection?
1 They will become plane wave fronts
2 They will remain spherical with the same curvature, both in magnitude and sign
3 They will remain spherical, but with different curvature, and different sign
4 They will remain spherical, with the same curvature, but sign of curvature reversed
Explanation:
If we consider a point source infront of a plane mirror then the waves coming from the source are spherical in shape. A virtual point image will be formed. The reflected waves also will be spherical having same curvature but moving in opposite direction.
