Human eye: The eye has a roughly spherical shape. The outer coat of eye is white. Its transparent front part is called cornea. Behind cornea a dark muscular structure is situated called iris. There is a small opening called the pupil. The size of the pupil is controlled by the iris. The iris controls the amount of light entering into the eye. The lens focuses light on the back of the eye, on a layer called retina. The retina contains several nerve cells. They transmit impulses to the brain through the optic nerve and hence, image is formed.

i) Angle of incidence is an angle formed between the incident ray and the normal.
ii) The angle formed between the reflected ray and the normal is called angle of reflection.
iii) It forms the image of an object at retina.

The diagram will be as follows:

Infinite number of images will be formed due to multiple reflections of light.

We know that, the angle of incidence is equal to the angle of reflection and the reflected ray is at an angle of 90° to the incident ray.
\(\therefore\ \angle i=\angle r=45^o\) 

Difference between regular and irregular reflection:

The two laws of reflection:
(i)The incident ray, reflected ray and normal lie in the same plane.
(ii)Angle of incidence is always equal to angle of reflection.

Yes.

When light hits an uneven surface, there are many angles of incidence. Hence, the parallel beam of light rays will be reflected off the surface at different angles.

White light can be formed by mixing the primary colours red, green and blue.

Black objects appear black because they absorb all the colours, no light is reflected.

Yes, nearly everything we see around us due to reflected light, e.q. moon receives light from the sun and reflects it.

No, the reflected rays from irregular surface are in different directions.

If we throw the light on the mirror along the normal, the light ray will be reflected back in opposite direction.

Since angle of incidence = angle of reflection. So, angle of incidence = 30°

The size of image formed by a plane mirror is same as that of the object in front of the mirror.

The ray is reflected infinite times between the two plane mirrors placed parallel to each other.

As per the given information point 'O' initial position of the man and I initial position of the image of the man can be show with the help of a figure.

Point O' final position of the man and I' final position of the image of the man. From the figure,
O'P + PI' = 5m [O'P = PI']
\(\Rightarrow\)   O'P+ O'P = 5m
\(\Rightarrow\)  O'P = 2.5m
Distance walked by the man = OP - O'P
 = 10 - 2.5
= 7.5m.

The correct diagrams are as below: