Ten questions. The result tells you which lessons you may skip.
A pinhole in a card stands between a lit bulb and a screen. The image on the screen is
A ray meets a plane mirror, making an angle of \(30°\) with the surface of the mirror. The angle of reflection is
The image of a wall clock in a plane mirror seems to show 3:40. The real time is
A ray is kept fixed while a plane mirror is turned through \(8°\). The reflected ray turns through
Two plane mirrors are at right angles. A ray that reflects once from each leaves
Two plane mirrors are inclined at \(60°\). The number of images of an object between them is
An object moves along the normal towards a plane mirror at \(3\,\text{m/s}\). The image approaches the object at
On the Cartesian sign convention, a concave mirror of radius of curvature \(30\,\text{cm}\) has a focal length of
An object is \(15\,\text{cm}\) in front of a concave mirror of focal length \(10\,\text{cm}\). The image distance is
An object \(30\,\text{cm}\) in front of a concave mirror of focal length \(20\,\text{cm}\) moves towards it along the axis at \(2\,\text{cm/s}\). The image moves