The speed of light in glass is ____ that in the air.

What is the SI unit of measurement of refractive index of a medium?

The refractive index of any medium is ____. 

The refractive index of air is ____. 

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.

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 _____.

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.

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?

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.

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.