Myopia can be corrected by using
concave lenses
contact lenses
prismatic lenses
convex lenses
Who discovered by his experiments with glass prisms that white light consists of seven colours?
Newton
Brewster
Maxwell
Young
With both eyes open, a person's field of view is about :
90°
150°
180°
360°
The size of the pupil of the eye is adjusted by :
cornea
ciliary muscles
optic nerve
iris
Instruments used in astronomical investigations are
microscopes
optical telescopes
radio telescopes
both (2) and (3)
We can see the sun before the actual sunrise by about :
5 minutes
2 minutes
2 hours
20 minutes
The red colour of the sun at the time of sunrise and sunset is because :
red colour is least scattered
blue colour is least scattered
red colour is most scattered
blue colour is most scattered
The blue colour of sky is due to :
scattering of light
refraction of light
diffraction of light
dispersion of light
A person finds difficulty in seeing nearby objects clearly.His vision can be corrected by using spectacles containing :
converging lenses
diverging lenses
chromatic lenses
The term "accomodation" as applied to the eye,refers to its ability to :
control the light intensity falling on the retina
erect the inverted image formed on the retina
vary the focal length of the lens
vary the distance between the lens and retina
