1967-02-08 — Page 29

数信亊

食一第張八第

日九廿月二十年干丙春夏

WAH KIU YAT

育僑華

日八月之前七六九一股公年六十五周民潋中

」,

期

串 15

"一項廣告方法漆程。 造修的飛寳起見,决定在六月中旬開設的 外海祂將腦告方法,以及陣灣人因在所 #3-WRINKLELIZNA POA 愛在工商的活動中,所佔的地位亦日益 (6)ECHEF£*£ • K+ & 史密斯教授主講

核保供定名爲「彎用降告方法 PR

4月十七晚開課

實用廣告方法

中大校外部

ACTICAL ADVERTISING

KUISKEYSE. 月上傣,控地點在荅中網帽茲烈街號 次,插於本(二月十七日區下午 傳開議,以後佢迤扇期五下午七時至八時 HODS) HOLE-EJERK |

始接受入舉報名,參加者可向該部 于二年,爲一有廣告學豐富經驗之學者。 上戸雜務,全網路衆四十元,現芑 ,史氏標在美國报任守体及廣告工作達

·基防史密斯(SMITH)甄拶用英語主 「實用度告方法」將由中文大學發育

一詞及報告4 阿沙中學校長斐利時修士,及宾炳分別 英奇主教主禮,校多路保祿修士,及粉敬 今日下午四時,舉行 若證,屆時由自 「九龍牛池灑聖約瑟英文學校新校舍,

全部建築安約二裨萬元,預算本年九月 。地发由政府撤出,並予免息資興建,

一.新校舍佔地三萬平方呎,樓高四, 簡案,及發職員衆公室,物理,化

九龍牛池灣

白主敎今奠基

聖約瑟學校

ZEBAKKAVECUN.

MET

女

考試題預習蓴欄。

物理科

(十五) ·梁海明·

中文中學會考試題預習專欄

PHYSICS. (15) H.M.Leung

Sölution.

27(a)

數學科

(十五)

第十四次預瞿試題解答

喬仲強 •

Scale 1 in €10 CM,

Ад яе пра ледихаду = ходеходы

X = 2

* x=24* - 3 <0 4 $* AT 76

$*£ $ $ £ **

60 * 2m+1} y^+ 4mx + } • • ¿ = 2

***FR 2 Lay 10 15 7 18 $ $ *** 3 * £ 78 › 2014

1 x =

um 116-8m-8 m

ip City rzxy + xy - x's City = 2 × × × × ̃g · **?

-4m 118(am- m*}

討論」

§àð 144 ] { 1 * * *y + 1 g } { \ 7

2

4 44'x'rikab)-(32a + 76x') &@adt4 A

#1)

= 4A2 (x-ga)~96′′ (x2- 8×′s = (x=80) (40”—4 b*)

#] 201·m - m"}

¿1⁄2 2-m-m'so:

$299 m = 2

"We trace back the ray from the image as follows: 1. A ray is drawn through the pule and 18 produced. 2. A parallel line 3 cm above the principal axis is drawn cutting the ray BÚ produced at C. Through C draw a perpendicular CD to the prane cipsl axie, then CD represents the object. Through C,draw a ray parallel t. the pricĂ- pal afle meeting the lene at E. Joịn EB cutting OA at F, F is the focus

By measurement: (i) the f3:5 lengtle?.75 cm

A § A = 4a2x2-320-q6*x*x 7¢ x® b2

抽出公因式

3

(11 the object te 1.75 cm in

the penalud dide of the

Faper

# 2. B Ag ax + bx-a è TR, SAME (Ad7b) (aš‡b) = • a

* adtb, apib aƒk • 3 **

t3)

答

Lene

由根與係!

--

$

li,

(ant bica/?b} = a ́da + ab (aƒs} T

(b)(i) image "upright?

The object should be placed between the fo cus and the pole.!

(1) image diminished

The object should be placed farther the lens than twice ite focal lenk

(111) virtual image,

The object should be placed between the focus and the pole

(See fig.(1) of this problem,)

(iv) the image is the same size as the object on The object should be placed at a distance

of twice its focal length from the lens.

(adt b; L=13.

P = - [ad#bitrantb)

#4 11 12 7+) A Log /3v

ONGKONG

ན

奖

08034 $

TOLIBR

(5)

** A * & ***. #RTA AJO

202] {1-m} > >

***** P*JA FAQ 4h

ཧཱུྃཥཏྟཾཟ+༥}(i n》 < 。

21m) → 0 0%

fr Me

9.]

m>m<-2,

JEPI XB NA, • I

第十五次預習試題

PB 10A B OPE ABIM LM 1P 14 Ž SE OR

XLE Z OPM GRPM..

AB

8$ ¿C=228. $25 AB ==AC + B¢ ́AG

↑ 11 #2 #1 ABCD #Ŵ*L BD£ 44-5 EF1BC. EGIÀ B

·Be

EGTAN

am'A taña ↑ Cos's rolʼA +1 = fan'A + cot”A

ABR 4312 & 100m.

AB 31 (20) RÐ 2° $ík · PAB = 26′′ -

FOR A B

28.(a)

Let b

cm be the height of the obje be the height of the image, then h

from

20 cm

Vo •

where f. -20 cm.

ст

Answer The pin must be placed 20 am in front

of the lens,

Light Comf

Source

Slide

Projectem

lens

Screen

Image

The above figure shows the optical system a projection lantern,

The illuminant le a special electric lamp to give a very concentrated source of light, In order that a clear picture may be obtained on & screen, a ^cozienser consisting of two planoconvex lenses collecte light and causÉB it te converge through the slide on the pro- jeation lens. The projection lene 28 80 mounted that it may be moved to and fro to focus

な

sharp image on the screen.

}`` A camera consists of a lens and a sensitive

film mounted on a light-tight box, with pro- vision for ed justing

the

stance of the

lene from the film.. A shutter with van- lable speed, and a diaphragm of vari. able aperture, re- gulate the amount of light through the lens

By turning the

screw mount of tua

lens, a sharp image

FOCUSING RING

DIAPHRAGM ADJUSTING RING

Topics for revision this weeks

1.

The compound microscope and the astronomical? ..lescope.

Dispersion of light by a prism. The pure spectrum

Questions

FILM SPOOL

79.(a)

of the scene is focused on the film. The screw mount varies the distance between lens and film. By pressing the shutter, & photograph can: be taken.

(c) The man can see an object at distances dowE

to 25 cm when wearing a cunver lens of focal length 27.5 cm.Let a

virtual image be formed

at a distance v om at

B without wearing a conven lens, Then

up - 25 cm, f-27.5 cm In the formula:

أمي

3

27.5

cm

t,

Draw a diagram to show the arrangement or the lenses in a mioroscope and trace the pathe to the eye of two raye from a. point of the objec not on the axis of the instrument. State the nature of the lenses and their relative focal lengthe

A microscope has an objective of facar length 2 cm and an eyepiece of focal length 6 cm.. the centres of the lenses being 15 cm apart. An object is placed 2.5 on from the objective Draw a diagram to scale to show how the image te formed by the objective, and measure the. magnification produced. Draw a second diagram to scale to show how the final image is pro- duced by the eyepiece and measure the mag- nification produced by the microscope. (c) A telescope objective of focal length 50 ft.

forme a real image of the moon which is 5 in in diameter. The moon is known to be 240,000 miles away from the earth. Find the size of the moone diameter in miles.

$25

3. (a).

Answer: Ble nearest point of distinct virion

19-277.om when be 18 got wear LOR spectacles.

(b)

What le s spectrum? Give a labelled anagram of the apparatus you would use to project a pure specturm on a screen. State the appearance: of the screen if sheets of blue and yellow. glass are placed ip path of the light (1), separately, (11) together.

Distinguish between a pure and Impure apel trum. Describe with the aid of a diagram how. you would, produce a pure spectrum of white.... 31ght on a white screen. How would you show that the colours of this spectrum can be recombined to produce white light?

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