Lenses Grade 9 IGCSE

​Lenses
By Muhammad Arief Kurniawan
Mutiara Harapan Islamic School

​Converging and diverging Lenses

Drag and Drop

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Lens: a lens that causes rays of light parallel to the axis to converge ​

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principal axis.



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Lens: a lens that causes rays of light parallel to the axis to diverge ​

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principal focus

Drag these tiles and drop them in the correct blank above

Converging

Diverging

at the

from the

Labelling

Match the label with the right place for Lens Diagram

Drag labels to their correct position on the image

parallel rays

Focus Length

Principal Focus

Principal Axis

​Diagram of lenses

​Image can be described in...

​their size = enlarged / same size / diminished

which way up they are = upright / inverted

where they are formed = real / virtual

Draw

Draw a simple reflected ray from this lense. the focal length is 5 blocks.

object is 3 block tall up. the object placed 12 block from the centre of the lense.

​Translating the magnifying glass

Drag and Drop

From the ray diagram, we can see the image produced by magnifying glass is

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(which way up they are)

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(size)

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(where they formed)

Drag these tiles and drop them in the correct blank above

virtual

enlarged

upright

real

same size

diminished

inverted

Normal Eyesight

​Short Sight and long sight

Match

Match the following

• the image formed in front of the retina

• the image formed in the back of retina

• cure of short sight

• cure of long sight

short sight

long sight

diverge lense

converge lense

• short sight

• long sight

• diverge lense

• converge lense

​Dispersion of Light

Open Ended

write the definition of dispersion

​Spectrum of Light

​Newton described the visible light spectrum as being made up of seven colours;
red-orange-yellow-green-blue-indigo-violet

Open Ended

Look again at the rainbow. You already know dispersion happened because of refraction. base on this picture, which colour refracted the most and which colour refracted the least.