Ray Optics Test...

A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle θ to the horizontal. The angle 0 for which the reflected ray becomes vertical is

A thin rod of 5cm length is kept along the axis of a concave mirror of 10cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be

A telescope using light having wavelength 5000 Åand using lenses of focal 2.5 and 30 cm. If the diameter of the aperture of the objective is 10 cm, then the resolving limit and magnifying power of the telescope is respectively

A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is

When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away isproportional to

A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is the

A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of lm from him. The minimum length of theplane mirror required is

A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed?

A plane mirror makes an angle of 30° with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray

A watch shows time as 3 : 25 when seen through amirror, time appeared will be