The angle of reflection is equal to the angle of incidence:
always
sometimes
under special conditions
never
Which of the following statements is true?
The angle of incidence is twice the angle of reflection
The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane
Some types of virtual images can be caught on the screens
A convex mirror forms real image
The image of an object formed by a plane mirror is:
virtual
real
diminished
upside-down
Cataract is a condition of eye when :
Eyesight becomes foggy
Eye lens becomes cloudy
There is a loss of vision
All of the above
The deficiency of one of the following in the diet of a person for a considerable time can lead to a disease called night blindness. This one is:
vitamin B
vitamin D
vitamin A
vitamin C
The persistence of the eye is only for:
1/10th of a second
1/12th of a second
1/16th of a second
1/20th of a second
The part which protects the human eye is called:
Cornea
Chroid
Retina
Blind spot
Refraction of light takes place in the
Pupil
Iris
If the angle between two mirrors is 180°,how many images will be formed?
1
2
3
many
The Braille code used by blind people use dots patterns for words. How many dot patterns or characters are used in this code?
52
63
48
26
