Dogs have the ability to hear the sound of range :

If the angle of incidence is 40^o the angle of reflection is :

For critical angle the angle of refraction is :

The comfortable distance up to which the normal eye can read is :

The to and fro motion of an object is called :

The angle in between the reflected ray and the normal drawn from the point of incidence is called :

The bouncing of light from a surface of a body is called :

The voice box of human being is called :

The vocal cords in men are about how many long?

Which will we get maximum number of images?