In what cases does a light ray not deviate at the interface of two media? `(AS_(7))`

You are given four sources of light each one providing a light of single colour - red, blue, green and yellow, Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90^(@) . Which of the following statement is correct if the source of yellow light is replaced with other lights without changing the angle of incidence?

At what angle does a ray of light remain incilned to the wavefront ?

What does polarisation of light prove about the nature of light?

what idea does diffraction of light give about the nature of light waves?

For what reasons does a real gas deviate from ideal behaviour?

What type of mirror is used by the dentists? Why a ray of light does not deviate as a result of refraction through a glass slab?

A parabola mirror is kept along y^2=4x and two light rays parallel to its axis are reflected along one straight line. If one of the incident light rays is at 3 units distance from the axis, then find the distance of the other incident ray from the axis.

A ray of light travelling through a denser medium is incident at an angle I in a rarer medium. If the angle between the reflected ray and refracted ray is 90^(@) , show that the critical angle of the two media, theta_(c) = sin^(-1) (tan i)

On what factor does the energy of X-rays depend?

Does refraction of light mean a change in the deviation of light propagation? If not, then what does refractive exactly mean?