Q81 of 112 Page 312

The angle of reflection is equal to the angle of incidence:

According to laws of reflection, angle of reflection is always equal to the angle of incidence. The law of reflection also states that the incident ray, reflected ray and the normal to a surface, all lie in the same plane.

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80

Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve, Blind spot.

 80

What are the functions of the following parts of the eye?

(a) Iris


(b) Eye-lens


(c) Ciliary muscles


(d) Retina


(e) Optic nerve

 82

The image formed by a plane mirror is:

 83

The least distance of distinct vision for a young adult with normal vision is about: