What type of lens is used as a 'magnifying glass'? How is the object positioned with respect to this lens? Draw the appropriate ray diagram.
Important Questions on Refraction and Dispersion of Light
The point, on the principal axis of a concave lens, from where a beam of incident parallel ray appears to diverge, is called the principal _____ of the concave lens.
The basic cause of refraction is the change in the speed of light as it goes from one medium to another.
In an optically denser medium, the speed of light is more than the speed of light in vacuum.
An obliquely incident light ray always bends away from the normal when it passes from one transparent medium into another.
A coin, kept at the bottom of an empty dry cup, appears to 'rise up' when some water is poured into the cup.
When white light is 'dispersed' by a glass prism, the yellow colour in it bends more than the blue colour.
Which of the following conditions is not necessary for a change in the direction of propagation when a light ray goes from one medium to another?
Which of the following diagrams correctly shows the 'bending of a light ray' as it goes from an optically denser medium into an optically rarer medium?
