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General
Easy
Question
An insect starts moving up in a liquid from point o of variable refractive index 
ay 
where y is depth of liquid from the surface. If u is the speed of insect, its apparent speed to the server E is
- none
The correct answer is:
Related Questions to study
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A parallel sided block of glass of refractive index 1.5 which is 36 mm thick rests on the floor of a tank which is filled with water (refractive index =4/3 ). The difference between apparent depth of floor at A &B when seen from vertically above is equal to
A parallel sided block of glass of refractive index 1.5 which is 36 mm thick rests on the floor of a tank which is filled with water (refractive index =4/3 ). The difference between apparent depth of floor at A &B when seen from vertically above is equal to
physics-General
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A ray of light is incident on a parallel slab of thickness 
and refractive index n. If the angle of incidence 
is small then the displacement in the incident and emergent ray will be :
A ray of light is incident on a parallel slab of thickness and refractive index n. If the angle of incidence is small then the displacement in the incident and emergent ray will be :
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In the figure shown 
is equal to:
In the figure shown is equal to:
physics-General
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A converging mirror 
, a point source S and a diverging mirror 
are arranged as shwon in figure. The source is placed at a distance of 30 cm from . The focal length of each of the mirrors is 20 cm. Consider only the images formed by a maximum of two reflections. It is found that one image is formed on the source itself. Find the distance between the two mirrors.
A converging mirror , a point source S and a diverging mirror are arranged as shwon in figure. The source is placed at a distance of 30 cm from . The focal length of each of the mirrors is 20 cm. Consider only the images formed by a maximum of two reflections. It is found that one image is formed on the source itself. Find the distance between the two mirrors.
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An object is placed in front of a concave mirror of focal length f as shown if figure. Choose the correct shape of the image :
An object is placed in front of a concave mirror of focal length f as shown if figure. Choose the correct shape of the image :
physics-General
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In the figure shown if the object ' O ' moves towards the plane mirror, then the image (which is formed after successive reflections from 
respectively) will move:
In the figure shown if the object ' O ' moves towards the plane mirror, then the image (which is formed after successive reflections from respectively) will move:
physics-General
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In the figure shown, the image of a real object is formed at point I. AB is the principal axis of the mirror. The mirror must be :
In the figure shown, the image of a real object is formed at point I. AB is the principal axis of the mirror. The mirror must be :
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A ray of light is incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is ( AB is the reflected ray)
A ray of light is incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is ( AB is the reflected ray)
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The circular boundary of the concave mirror subtends a cone of half angle at its centre of curvature. The minimum value of for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is
The circular boundary of the concave mirror subtends a cone of half angle at its centre of curvature. The minimum value of for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is
physics-General
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A concave mirror of focal length 20 cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1 cm from the previous principle axis AB. The distance between the images formed by the two parts. If the object is kept at a distance of 10 cm from the pole of the original principal axis is
A concave mirror of focal length 20 cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1 cm from the previous principle axis AB. The distance between the images formed by the two parts. If the object is kept at a distance of 10 cm from the pole of the original principal axis is
physics-General
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Two blocks each of mass 
lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
Two blocks each of mass lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
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A plane mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source ' S ' kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity V towards the wall. Then
A plane mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source ' S ' kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity V towards the wall. Then
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Find the velocity of image of a moving particle O^' in the situation as shown in the figure.
Find the velocity of image of a moving particle O^' in the situation as shown in the figure.
physics-General
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As shown in the figure, a particle is placed at 0 in front of a plane mirror M. A man at P can move along path PY and PY'. Then which of the following is true?
As shown in the figure, a particle is placed at 0 in front of a plane mirror M. A man at P can move along path PY and PY'. Then which of the following is true?
physics-General
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Two plane mirrors of length 
are separated by distance and a 
is standing at distance from the connecting line of mirrors as shown in figure. A man is walking along a straight line at distance 2 L parallel to the mirrors at speed u. Then the man at 
will be able to see image of for total time of
Two plane mirrors of length are separated by distance and a is standing at distance from the connecting line of mirrors as shown in figure. A man is walking along a straight line at distance 2 L parallel to the mirrors at speed u. Then the man at will be able to see image of for total time of
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