Why is it sometimes written in this way on the front of the ambulance?

The word ambulance would appear like the above when reflected in a plane mirror. It is written in this way to help a person driving a vehicle ahead of the ambulance to read it in the correct order as AMBULANCE when he/she sees the rear-view mirror, and give way for it to pass through. This happens because the rear-view mirror forms a laterally inverted image.

Here is the equation for Snell's law: n = sin i sin r . Copy the equation and state what the symbols n , i , r stands for.

The ratio of the sin of the angles of incidence and refraction is equal to the ratio of the refractive index of the materials at the interface, according to Snell's Law. The equation for Snell's law is as follows: n = sin i sin r where n is the refractive index of the medium, i , r being the angle of incidence and angle of reflection of the light. All angles are measured from the normal.

E M B I B E

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 3

EASY

Upper Secondary: IGCSE

IMPORTANT

Earn 100

Draw a diagram to show how a ray of light is refracted when it passes from one material to another. Mark the normal and the angles of incidence and refraction.

Important Questions on Light

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.1

Write the word AMBULANCE as it would appear when reflected in a plane mirror.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.1

Why is it sometimes written in this way Question Image

on the front of the ambulance?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.5

Draw a diagram to show what we mean by the angle of incidence and angle of refraction for a refracted ray of light.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 4

Write an equation relating the refractive index of a material to the speed of light in vacuum and the speed of light in the material.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 4

Here is the equation for Snell's law:

n = \frac{\sin (i)}{\sin (r)}

. Copy the equation and state what the symbols

n, i, r

stands for.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 5

Draw a diagram to show how a ray of light is refracted when it strikes the internal surface of piece of glass at an angle smaller than the critical angle. Label incident, refracted and reflected rays.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 6

Draw a diagram to show how a converging lens causes parallel rays of light to be focussed.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 8

The law of reflection says that : "When a ray of light is reflected at a surface, the angle of incidence is equal to the angle of reflection". Draw a diagram to indicate how a ray of light is reflected by a flat mirror, and mark the two angles mentioned in the law.

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