We can see the sun before the actual sunrise by about :
5 minutes
2 minutes
2 hours
20 minutes
A person finds difficulty in seeing nearby objects clearly.His vision can be corrected by using spectacles containing :
converging lenses
diverging lenses
prismatic lenses
chromatic lenses
Instruments used in astronomical investigations are
microscopes
optical telescopes
radio telescopes
both (2) and (3)
The animals of prey have :
two eyes at the front
two eyes at the back
two eyes on the sides
one eye at the front and one on the side
The splitting up of white light in to seven colours on passing through a glass prism is called
Refraction
Diffraction
Dispersion
Scattering
Myopia can be corrected by using
concave lenses
contact lenses
convex lenses
A young man has to hold a book at arm's length to be able to read it clearly.The defect of vision is :
astigmatism
myopia
presbyopia
hypermetropia
Who discovered by his experiments with glass prisms that white light consists of seven colours?
Newton
Brewster
Maxwell
Young
The human eye forms the image of an object at its :
cornea
iris
pupil
retina
The blue colour of sky is due to :
scattering of light
refraction of light
diffraction of light
dispersion of light
