light

Question 1

what is incident ray, reflected ray, angle of reflection and angle of incidence.

Answer 1

incident ray- the light which strikes any object.
reflected ray- the light which hits back the object.
angle of reflection- the angle between normal and reflected ray.
angle of incidence- the angle between normal and incident ray.

Question 2

law of reflection

Answer 2

1. the angle of reflection is equal to angle of incidence.
2. the reflcted ray, incident ray and the normal lie on same plane.

Question 3

what is regular and irregular reflection.

Answer 3

regular reflection - reflection from smooth surfaces. parallel.
irreguler reflection - reflection from rough surfaces. not parallel.

Question 4

what are illuminated, luminous objects and dispersion.

Answer 4

illuminated - the objects shine coz of others light.
luminous - the objects chine coz of their own light.
dispersion - white colour when spereads in seven different colours.

Question 5

structure of eye

Answer 5

cornea - the interior of eye id transparent.
iris - dark muscular structure.
pupil - teh small opening on iris.
retina - light focus on the back of the eye.
cones - cells sensitive to bright light.
rods - cells sensitive to dim light.

Question 6

care of eye

Answer 6

• too little or too much light is not good.
• do not look at sun or powerful light directly.
• wash your eyes with clean water.
• do not rub eyes with dirty hands.
• always read at the normal distance.

Question 7

what is braille

Answer 7

resource for visually challenged peoples. it was adopted in 1932. many indian languanges can be read using the braille system. it had 63 dots pattern or characters.