Physics
Grade-10
Easy
Question
The refractive index of any medium is ____.
- <=0
- >=1
- <=1
- >=0
Hint:
The measure of how much a light beam bends as it travels through different media is called the refractive index.
The correct answer is: >=1
The refractive index of any medium is >=1
- The refractive index is the difference in the speed of light in any medium and air.
- It can alternatively be described as the relationship between the speed of a light ray in a substance and the speed of a light ray in a vacuum, or n = c/v.
- Air is a medium that has no density and has a refractive index of 1.
- The refractive index of any medium other than air will be greater than 1.
- Because light always travels at a slower speed in a medium than it does in a vacuum, the refractive index of a media is always greater than 1 (it cannot be less than 1).
Related Questions to study
Physics
The refractive index of air is ____.
The refractive index of air is ____.
PhysicsGrade-10
Physics
The speed of light in a vacuum is ______ m/s.
The speed of light in a vacuum is ______ m/s.
PhysicsGrade-10
Physics
The radius of curvature of a convex mirror is taken to be _____.
the center of curvature and focus lies behind the convex mirror, hence the signs are taken as positive.
The radius of curvature of a convex mirror is taken to be _____.
PhysicsGrade-10
the center of curvature and focus lies behind the convex mirror, hence the signs are taken as positive.
Physics
For an image formed behind a mirror towards the right, the sign for the image distance is _____.
For an image formed behind a mirror towards the right, the sign for the image distance is _____.
PhysicsGrade-10
Physics
For an object standing in front of a spherical mirror, the object distance is _____.
For an object standing in front of a spherical mirror, the object distance is _____.
PhysicsGrade-10
Physics
The height of a virtual and upright image is ____ as per the new cartesian sign convention.
The height of a virtual and upright image is ____ as per the new cartesian sign convention.
PhysicsGrade-10
Physics
The height of a real and inverted image is _____ as per the new cartesian sign convention.
The height of a real and inverted image is _____ as per the new cartesian sign convention.
PhysicsGrade-10
Physics
Before plugging in the values of various quantities in the expression to calculate the magnification it is important to _____.
Before plugging in the values of various quantities in the expression to calculate the magnification it is important to _____.
PhysicsGrade-10
Physics
The magnification of the image of an object is found to be 1.25. Which of the following is true about it?
The magnification of the image of an object is found to be 1.25. Which of the following is true about it?
PhysicsGrade-10
Physics
An object is placed at a distance of 20 cm from a convex mirror. Its image is formed at a distance of 10 cm from the mirror. The magnification is ____.
An object is placed at a distance of 20 cm from a convex mirror. Its image is formed at a distance of 10 cm from the mirror. The magnification is ____.
PhysicsGrade-10
Physics
Which of the following should be taken as negative according to the new cartesian sign convention? (Note: the object is standing in front of a concave mirror.)
all the given cases show negative signs for a concave mirror.
Which of the following should be taken as negative according to the new cartesian sign convention? (Note: the object is standing in front of a concave mirror.)
PhysicsGrade-10
all the given cases show negative signs for a concave mirror.
Physics
The height of a real and inverted image of an object of size 4 cm is 20 cm. The ratio of the image distance and the object distance is _____.
The height of a real and inverted image of an object of size 4 cm is 20 cm. The ratio of the image distance and the object distance is _____.
PhysicsGrade-10
Physics
Which of the following should be taken as positive according to the new cartesian sign convention? (Note: the object is standing in front of the mirror along the +y direction.)
both the height of an object and the height of a virtual and upright image are positive.
Which of the following should be taken as positive according to the new cartesian sign convention? (Note: the object is standing in front of the mirror along the +y direction.)
PhysicsGrade-10
both the height of an object and the height of a virtual and upright image are positive.
Physics
A real image is always _____.
the real image is always formed as inverted, therefore, for real image height is taken as negative.
A real image is always _____.
PhysicsGrade-10
the real image is always formed as inverted, therefore, for real image height is taken as negative.
Physics
An object of size 12 cm is placed in front of a concave mirror, it forms a real and inverted image of size 18 cm. What is the magnification of the image?
An object of size 12 cm is placed in front of a concave mirror, it forms a real and inverted image of size 18 cm. What is the magnification of the image?
PhysicsGrade-10
