Ray Optics and Optical Instruments
Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Ray Optics and Optical Instruments” of Physics.
Q1.There are certain material developed in laboratories which have a negative refractive index A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by
Q2.The phenomena involved in the reflection of radiowaves by ionosphere is similar to
Q3.The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 . Which of the four rays correctly shows the direction of reflected ray?
Q4.The optical density of turpentine is higher than that of water while its mass density is lower. shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Fig 9.2, the path shown is correct?
Q5.A car is moving with at a constant speed of 60 km h–1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km h –1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement(s) is/are correct?
Q6.The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it will
Q7.Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because
(i) the apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.
(ii) the angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.
(iii) some of the points of the object far away from the edge may not be visible because of total internal reflection.
(iv) water in a trough acts as a lens and magnifies the object.