Light

An object is positioned between a lamp and a screen. A student examines how the height of the shadow formed by the object on the screen varies. The apparatus is shown in Fig. 4.1. The object is a square piece of white card. Each side has length $H$. The object is fixed to a pin and held up by a cork, as shown in Fig. 4.2.

May/June 2017

Which statement comparing red light with violet light is correct?

May/June 2025

Which statement concerning red light and blue light is correct?

Oct/Nov 2015

A student uses a pin-hole camera to form an image. The pin-hole camera is made from a light-proof box with a tiny hole (pin-hole) on one side and a very thin paper screen on the opposite side. The student aims the pin-hole of the camera at a bright window. Light enters the camera through the pin-hole and forms an image on the thin paper screen.

Oct/Nov 2015

The diagrams illustrate light moving through air and striking the surface of a glass block. Part of the light is reflected and part is refracted. Which diagram shows the reflection and refraction of the light?

Oct/Nov 2023