A ray from a fixed object is incident of a plane mirror at an angle of 20°.If the mirror is rotated through 30°,by how many degree will the reflected ray be

the reflected ray will rotate through 60 degrees

Explanation:

It all depends on the axis about which the mirror rotates and also the direction about the axis of rotation (clockwise or anticlockwise). If the axis of rotation is orthogonal to the plane of the mirror is zero the reflected ray will not rotate. If the axis of rotation is within the mirror plane and orthogonal to the projection of the incident ray onto the mirror plane the reflected ray will rotate through 60 degrees.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

i already answered it by 34/s