Chapter 9 – Ray Optics and Optical Instruments

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 it will 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 [...]

A thin convex lens of focal length 25 cm is cut into two pieces 0.5 cm above the principal axis. The top part is placed at (0.0) and an object placed at (−50cm,0). Find the coordinates of the image. 0). Find the coordinates of the image. A thin convex lens of focal length 25 cm [...]

A circular disc of radius ‘R’ is placed co-axially and horizontally inside and opaque hemispherical bowl of radius ‘a’, Fig. The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc [...]

A short object of length L is placed along the principal axis of a concave mirror away from focus. The object distance is u. If the mirror has a focal length f, what will be the length of the image ? You may take L A short object of length L is placed along the [...]

An object approaches a convergent lens from the left of the lens with a uniform speed 5m/s and stops at the focus. The image An object approaches a convergent lens from the left of the lens with a uniform speed 5m/s and stops at the focus. The image November 19, 2020 Category: Chapter 9 - [...]

An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens is reversed ? An unsymmetrical double convex thin lens forms the image of a point object on its axis. Will the position of the image change if the lens [...]

A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab, the first colour to emerge is A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab the first colour to emerge [...]

The near vision of an average person is 25cm. To view an object with an angular magnification of 10, what should be the power of the microscope ? The near vision of an average person is 25cm. To view an object with an angular magnification of 10 what should be the power of the microscope [...]

Will the focal length of a lens for red light be more, same or less than that for blue light ? same or less than that for blue light ? Will the focal length of a lens for red light be more November 19, 2020 Category: Chapter 9 - Ray Optics and Optical Instruments , [...]

A car is moving with a constant speed of 60kmh^−1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh^−1. In order to keep track of the car in the rear, the driver [...]