Question

Match the following

	List I		List II
1	Glass slab	a	Emergent ray parallel to the incident ray
2	Angle of prism	b	Angle between the lateral faces of a triangular glass prism
3	Angle of deviation	c	Angle between incident and refracted ray
4	Normal	d	Ray of light perpendicular to the lateral face of the triangular prism

• A. True
• B. False

Answer 1

The correct option is B False

In a glass slab, the emergent ray is parallel to the incident ray. A triangular glass prism has two triangular bases and three rectangular lateral surfaces. These surfaces are inclined to each other and the angle between its two lateral faces is called the angle of the prism. When an incident ray of light enters a prism it gets refracted towards the normal. This refracted ray then strikes the other face of the prism and further deviates away from the normal and leaves the glass prism to enter the air i.e. from one medium to the other. This ray that leaves the prism is called emergent ray. The angle formed between the incident ray and emergent ray is called angle of deviation. The incident ray of light that is perpendicular to the lateral surface of the prism is called normal.