Short Answer TypeA lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the image formation.
A ray of light travels from water to air as shown in the diagram given below:
(i) Copy the diagram and complete the path of the way. Given the critical angle for water is 48o.
(ii) State the condition so that internal reflection occurs in the above diagram.
(i) When the angle of incidence in water is at a critical value, then the refracted ray lies along the boundary, having an angle of 90°.
(ii)Necessary conditions for total internal reflection in the above figure are:
I. The ray of light must travel from a denser medium into a rarer medium.
II. The angle of incidence in the denser medium must be greater than the critical angle for that pair of media.
The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P are shown upto the water surface.
(i) Show in the diagram the path of these rays after striking the water surface.
The Critical Angle for water air surface is 48o
(ii) Name the phenomenon which the rays B and D exhibit.
Name the phenomenon that causes a loud sound when the stem of a vibrating tuning fork is kept pressed on the surface of a table.
Switch
