Which one of the following statement about the refractive index of a material medium with respect to air is correct?
Question 5 A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be: (a) greater than unity (b) less than unity (c) equal to unity (d) zero
Can absolute value of refractive index be less than unity?
One of the following does not apply to a concave mirror. This is : (a) focal length is negative (b) image distance can be positive or negative (c) image distance is always positive (d) height of image can be positive or negative
Only one of the following applies to a concave lens. This is : (a) focal length is positive (b) image distance can be positive or negative (c) height of image can be positive or negative (d) image distance is always negative