The exposed surface of the human eye ball has a transparent covering called
Iris
Pupil
Cornea
Retina
Refractive index of Glycerine is
1.33
1.44
1.47
1.36
Behind the cornea of human eye, is the opaque muscular diaphragm called
Ciliary muscles
The small aperture in the centre of the iris is called
Eye lens
retina
Ultraviolet rays help to produce vitamin
Vitamin-A
Vitamin-B
Vitamin-C
Vitamin-D
When the object is beyond 2F, the image formed is
at F
at 2F
Between F and 2F
at infinity
When a light ray travels from a rarer medium to a denser medium
It bends towards the normal
It bends away from the normal
The ray suffers no refraction
None of these
Which of the following help us to see tiny objects which are magnified many more times than a simple microscope ?
Compound microscope
Telescope
Stethoscope
The phenomenon in which electrons are released from matter on absorption of light energy is called
Photoelectric effect
Refraction
Dispersion
The ability of the eye lens to self adjust its focal length is termed as the
Power of accomodation
Persistance of vision
Reflection of light
