Rainbows are formed due to
Diffraction of light
Dispersion of light
Convergence of light
Divergence of light
Which of the following lens is thicker in the middle and thinner at the edges ?
Convex lens
Concave lens
Prism
None of these
Where will the image be formed when the object is at infinity ?
At F
At F on other side of the lens
At 2F
At 2F on other side of the lens
Behind the cornea of human eye, is the opaque muscular diaphragm called
Iris
Pupil
Retina
Ciliary muscles
The separation of a beam of white light into its constituent colours is known as
Refraction of light
Reflection of light
The exposed surface of the human eye ball has a transparent covering called
Cornea
Which of the following help us to see tiny objects which are magnified many more times than a simple microscope ?
Compound microscope
Telescope
Stethoscope
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
The defect of myopia can be corrected by using
