Человек-невидимка/Invisible Man (Герберт Уеллс). Страница 77 из 117

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"

Yes

,

"

said

Kemp

,

"

that

is

pretty

plain

sailing

.

"

"

And

here

is

another

fact

you

will

know

to

be

true

.

If

a

sheet

of

glass

is

smashed

,

Kemp

,

and

beaten

into

a

powder

,

it

becomes

much

more

visible

while

it

is

in

the

air

;

it

becomes

at

last

an

opaque

white

powder

.

This

is

because

the

powdering

multiplies

the

surfaces

of

the

glass

at

which

refraction

and

reflection

occur

.

In

the

sheet

of

glass

there

are

only

two

surfaces

;

in

the

powder

the

light

is

reflected

or

refracted

by

each

grain

it

passes

through

,

and

very

little

gets

right

through

the

powder

.

But

if

the

white

powdered

glass

is

put

into

water

,

it

forthwith

vanishes

.

The

powdered

glass

and

water

have

much

the

same

refractive

index

;

that

is

,

the

light

undergoes

very

little

refraction

or

reflection

in

passing

from

one

to

the

other

.

"

You

make

the

glass

invisible

by

putting

it

into

a

liquid

of

nearly

the

same

refractive

index

;

a

transparent

thing

becomes

invisible

if

it

is

put

in

any

medium

of

almost

the

same

refractive

index

.

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And

if

you

will

consider

only

a

second

,

you

will

see

also

that

the

powder

of

glass

might

be

made

to

vanish

in

air

,

if

its

refractive

index

could

be

made

the

same

as

that

of

air

;

for

then

there

would

be

no

refraction

or

reflection

as

the

light

passed

from

glass

to

air

.

"

"

Yes

,

yes

,

"

said

Kemp

.

"

But

a

man

's

not

powdered

glass

!

"

"

No

,

"

said

Griffin

.

"

He

's

more

transparent

!

"

"

Nonsense

!

"

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"

That

from

a

doctor

!

How

one

forgets

!

Have

you

already

forgotten

your

physics

,

in

ten

years

?

Just

think

of

all

the

things

that

are

transparent

and

seem

not

to

be

so

.

Paper

,

for

instance

,

is

made

up

of

transparent

fibres

,

and

it

is

white

and

opaque

only

for

the

same

reason

that

a

powder

of

glass

is

white

and

opaque

.

Oil

white

paper

,

fill

up

the

interstices

between

the

particles

with

oil

so

that

there

is

no

longer

refraction

or

reflection

except

at

the

surfaces

,

and

it

becomes

as

transparent

as

glass

.

And

not

only

paper

,

but

cotton

fibre

,

linen

fibre

,

wool

fibre

,

woody

fibre

,

and

bone

,

Kemp

,

flesh

,

Kemp

,

hair

,

Kemp

,

nails

and

nerves

,

Kemp

,

in

fact

the

whole

fabric

of

a

man

except

the

red

of

his

blood

and

the

black

pigment

of

hair

,

are

all

made

up

of

transparent

,

colourless

tissue

.

So

little

suffices

to

make

us

visible

one

to

the

other

.

For

the

most

part

the

fibres

of

a

living

creature

are

no

more

opaque

than

water

.

"

"

Great

Heavens

!

"

cried

Kemp

.

"

Of

course

,

of

course

!

I

was

thinking

only

last

night

of

the

sea

larvae

and

all

jelly-fish

!

"

"

Now

you

have

me

!

And

all

that

I

knew

and

had

in

mind

a

year

after

I

left

London

--

six

years

ago

.

But

I

kept

it

to

myself

.

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