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

### The refractive index of air is ____.

### The refractive index of air is ____.

### The speed of light in a vacuum is ______ m/s.

### The speed of light in a vacuum is ______ m/s.

### 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 _____.

the center of curvature and focus lies behind the convex mirror, hence the signs are taken as positive.

### 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 _____.

### 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 _____.

### 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.

### 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.

### 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 _____.

### 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?

### 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 ____.

### 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.)

all the given cases show negative signs for a concave mirror.

### 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 _____.

### 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.)

both the height of an object and the height of a virtual and upright image are positive.

### 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 _____.

the real image is always formed as inverted, therefore, for real image height is taken as negative.