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>Questions>Q 13.3

HARD

Upper Secondary: IGCSE

IMPORTANT

Earn 100

A converging lens has focal length $5 cm$ . An object is placed $3 cm$ from the centre of the lens, on the principal axis. Draw an accurate ray diagram to represent this.

Important Questions on Light

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.3

A converging lens has a focal length

5 cm

. An object is placed

3 cm

from the centre of the lens, on the principal axis. Use your diagram. To determine the distance of the virtual image formed from the lens.
Question Image

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 1

Draw a diagram to show how a ray of light is reflected by a plane mirror. Mark the normal and the angles of incidence and reflection.

EASY

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>End-of-chapter questions>Q 1

Write an equation that shows how angle of reflection and angle of incidence are related by the law of reflection. Write the equation both in words and in symbols.

EASY

Upper Secondary: IGCSE

IMPORTANT

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

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.

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.