kelanjutan :)

Jawaban :

1.     1.  Diketahui : lensa objektif

P =  1/20

F  =  1/p

F  = 100/p cm

100/1/20

= 100 x 20

= 2000cm

 fob = 2000 cm

Lensa Okuler 

P = 20 dioptri

f = 1/p

f = 100/p cm

= 100/20

= 5 cm

Perbesaran bayangan : M  = fob/fok  =   2000/5

= 400

2.    2.  Diketahui :

fob = 100

fok = -25cm

Panjang teropong :

D = fob + fok

= 100 + (-25)

=75

3.  3.    Diketahui : M= 6 kali

Ditanya : fob .......?

              fok.........?

M =fob/fok

6 = fob/fok

fob = 6 . fok

fob =  60 cm 

fok = 10 cm

4.    4.  1. Cermin lebih mudah dibuat dan muran daripada lensa

2. cermin tidak mengalami aberasi kromatik (penguraian warna)

3. cermin lebih ringan daripada lensa yang berukuran sama sehingga lebih mudah digantung

5.    5.  Tegak terhadap arah benda semula

6.  6.   Dua prisma siku-siku disisipkan antara lensa objektif dan lensa okuler.

Fisika uy :D

1.    1.   Sebuah teropong bintang mempunyai kekuatan lensa untuk objektif dan okuler. Masing-masing 1/20 dioptri dan 20 dioptri. Berapakah perbesaran bayangan bintang yang diamati …

2.   2.    Sebuah teropong panggung/galilei focus objektif 100cm dan focus okuler -25 cm. berapakah panjang teropong panggung tersebut …

3.     3.  Perbesaran bayangan pada sebuah teropong sederhana adalah 6 kali . manakah pasangan yang benar untuk jarak focus lensa objektif dan lensa okuler……

4.      4. Mengapa cermin digunakan sebagai pengganti lensa objektif ?

 

5.    5.  Bayangan akhir yang dibentuk oleh lensa okuler terlihat oleh mata adalah …..

 
6.Untuk membalik bayangan teropong prisma menggunakan …………… yang disisipkan di……………………………

PREPOSITION IN, ON, AND AT

Prepositions of Time: at, in, on

We use:

• at for a PRECISE TIME
• in for MONTHS, YEARS, CENTURIES and LONG PERIODS
• on for DAYS and DATES

at	in	on
PRECISE TIME	MONTHS, YEARS, CENTURIES and LONG PERIODS	DAYS and DATES
at 3 o'clock	in May	on Sunday
at 10.30am	in summer	on Tuesdays
at noon	in the summer	on 6 March
at dinnertime	in 1990	on 25 Dec. 2010
at bedtime	in the 1990s	on Christmas Day
at sunrise	in the next century	on Independence Day
at sunset	in the Ice Age	on my birthday
at the moment	in the past/future	on New Year's Eve

Look at these examples:

• I have a meeting at 9am.
• The shop closes at midnight.
• Jane went home at lunchtime.
• In England, it often snows in December.
• Do you think we will go to Jupiter in the future?
• There should be a lot of progress in the next century.
• Do you work on Mondays?
• Her birthday is on 20 November.
• Where will you be on New Year's Day?

Notice the use of the preposition of time at in the following standard expressions:

Expression	Example
at night	The stars shine at night.
at the weekend	I don't usually work at the weekend.
at Christmas/Easter	I stay with my family at Christmas.
at the same time	We finished the test at the same time.
at present	He's not home at present. Try later.

Notice the use of the prepositions of time in and on in these common expressions:

in	on
in the morning	on Tuesday morning
in the mornings	on Saturday mornings
in the afternoon(s)	on Sunday afternoons
in the evening(s)	on Monday evening

When we say last, next, every, this we do not also use at, in, on.

• I went to London last June. (not in last June)
• He's coming back next Tuesday. (not on next Tuesday)
• I go home every Easter. (not at every Easter)
• We'll call you this evening. (not in this evening)

VOCABULARY AROUND THE HOUSE

Vocabulary around the house is an situation when we use english for everday in our hole life and we spelled the grammar well. Begin in our daily life at home e.g. with our parents,friends,bro,sister,grandpa,grandma,or maybe with your teachers? then, your neighboor,your lab partner,etc. I don't know how to explain it well, but i would share to you about something I know or just give you an idea foR the bassicly english. make your head stay cool.





Things you may find around the house
* Light bulb(s)
* Plug(s)
* Socket(s)
* Torch(es)
* Ceiling light(s)
* Lamp(s)
* Curtain(s)
* Shelf (shelves)
* Telephone(s)
* Box(es)
* Plug(s)
* Battery (batteries)
* Photo(graph)(s)






Rooms
* Living Room
* Settee(s)
* Armchair(s)
* Coffee table(s)
* Display cabinet(s)
* Hifi stand(s)
* TV cabinet(s)
* Television(s) / tv(s)
* Hifi(s)
* Speaker(s)
* Cushion(s)
* Rug(s)






Things we do in the Living Room
* People watch TV in the living room.
* People sit and read a book in the living room.
* People listen to music in the living room.

Bedroom
* Bed(s)
* Bedside cabinet(s)
* Bedside table(s)
* Dressing table(s)
* Wardrobe(s)
* Chest of drawer(s)
* Brush(es)
* Comb(s)
* Hair dryer(s)
* Pillow(s)
* Sheet(s)
* Clothes

Things we do in the Bed Room
* People listen to music in the bedroom.
* People sleep in the bedroom.
* People get dressed or undressed in the bedroom.

Kitchen
* Table(s)
* Chair(s)
* Bin(s)
* Cooker(s) / oven(s)
* Microwave (oven)(s)
* fridge(s)
* dishwasher(s)
* Tap(s)
* Coffee maker(s)
* Food mixer(s)
* Coffee maker(s)
* Food mixer(s)
* Liquidizer(s)
* Saucepan(s)
* Frying pan(s)
* sieve(s)
* Kettle(s)
* teapot(s)

Things we do in the Kitchen
* People prepare food in the kitchen.
* People cook in the kitchen.
* People sometimes eat in the kitchen.
* People make coffee or tea in the kitchen.
* People put the food away in the kitchen cupboards.


Bathroom
* Chair(s)
* Basin(s)
* Bath(s)
* Toilet(s)
* Toilet roll(s)
* Toilet brush(es)
* hairdryer (hairdryers)
* toothbrush(es)
* Shaving foam razor(s)
* Toilet seat(s)


Things we do in the Bed Room
* People get dressed or undressed in the bathroom.
* People have a shave in the bathroom.
* People brush their teeth in the bathroom.
* People take a shower in the bathroom.
* People have a bath in the bathroom.


Other Rooms:
Attic : People store things in the attic.
Ballroom : A room in stately homes where rich people dance and concerts are held.
Box Room : A small room used for storage.
Cellar : Underneath the house.
Cloakroom : A small room where people put their coats.
Conservatory : A greenhouse attached to a house for the display of plants.
Dining Room : A room where people eat.
Drawing Room : A room in stately homes where rich people entertain.
Games Room : A room in large houses where games are played.
Hall : The entrance passage to a house.
Larder : A small room used for the storage of food.
Library : A room where books are kept.
Lounge : Another name for living room.
Music Room : A room where people play music.
Office : A room where people work.
Pantry : A small room used to store kitchen and dining items.
Parlor : Old fashioned word for living room.
Sitting Room : Another name for living room.
Guest Room : A room where guests sleep.
Toilet : A room where people go to the toilet (often known as WC)
Utility Room : A room where appliances such as washing machines are use

Passive Voice :h:

Use of Passive

Passive voice is used when the focus is on the action. It is not important or not known, however, who or what is performing the action.

Example: My bike was stolen.

In the example above, the focus is on the fact that my bike was stolen. I do not know, however, who did it.
Sometimes a statement in passive is more polite than active voice, as the following example shows:

Example: A mistake was made.

In this case, I focus on the fact that a mistake was made, but I do not blame anyone (e.g. You have made a mistake.).

Form of Passive

Subject + finite form of to be + Past Participle (3rd column of irregular verbs)

Example: A letter was written.

When rewriting active sentences in passive voice, note the following:

• the object of the active sentence becomes the subject of the passive sentence
• the finite form of the verb is changed (to be + past participle)
• the subject of the active sentence becomes the object of the passive sentence (or is dropped)

Examples of Passive

Tense		Subject	Verb	Object
Simple Present	Active:	Rita	writes	a letter.
	Passive:	A letter	is written	by Rita.
Simple Past	Active:	Rita	wrote	a letter.
	Passive:	A letter	was written	by Rita.
Present Perfect	Active:	Rita	has written	a letter.
	Passive:	A letter	has been written	by Rita.
Future I	Active:	Rita	will write	a letter.
	Passive:	A letter	will be written	by Rita.
Hilfsverben	Active:	Rita	can write	a letter.
	Passive:	A letter	can be written	by Rita.

Examples of Passive

Tense		Subject	Verb	Object
Present Progressive	Active:	Rita	is writing	a letter.
	Passive:	A letter	is being written	by Rita.
Past Progressive	Active:	Rita	was writing	a letter.
	Passive:	A letter	was being written	by Rita.
Past Perfect	Active:	Rita	had written	a letter.
	Passive:	A letter	had been written	by Rita.
Future II	Active:	Rita	will have written	a letter.
	Passive:	A letter	will have been written	by Rita.
Conditional I	Active:	Rita	would write	a letter.
	Passive:	A letter	would be written	by Rita.
Conditional II	Active:	Rita	would have written	a letter.
	Passive:	A letter	would have been written	by Rita.

Passive Sentences with Two Objects

Rewriting an active sentence with two objects in passive voice means that one of the two objects becomes the subject, the other one remains an object. Which object to transform into a subject depends on what you want to put the focus on.

	Subject	Verb	Object 1	Object 2
Active:	Rita	wrote	a letter	to me.
Passive:	A letter	was written	to me	by Rita.
Passive:	I	was written	a letter	by Rita.

. As you can see in the examples, adding by Rita does not sound very elegant. That’s why it is usually dropped.

Personal and Impersonal Passive

Personal Passive simply means that the object of the active sentence becomes the subject of the passive sentence. So every verb that needs an object (transitive verb) can form a personal passive.

Example: They build houses. – Houses are built.

Verbs without an object (intransitive verb) normally cannot form a personal passive sentence (as there is no object that can become the subject of the passive sentence). If you want to use an intransitive verb in passive voice, you need an impersonal construction – therefore this passive is called Impersonal Passive.

Example: he says – it is said

Impersonal Passive is not as common in English as in some other languages (e.g. German, Latin). In English, Impersonal Passive is only possible with verbs of perception (e. g. say, think, know).

Example: They say that women live longer than men. – It is said that women live longer than men.

Although Impersonal Passive is possible here, Personal Passive is more common.

Example: They say that women live longer than men. – Women are said to live longer than men.

The subject of the subordinate clause (women) goes to the beginning of the sentence; the verb of perception is put into passive voice. The rest of the sentence is added using an infinitive construction with 'to' (certain auxiliary verbs and that are dropped).
Sometimes the term Personal Passive is used in English lessons if the indirect object of an active sentence is to become the subject of the passive sentence.

ASKING IF SOMEONE REMEMBERS OR NOT

Formal expressions: :h:
- I wonder if you remember.....
- You remember...., don’t you?
- You haven’t forgotten...., have you?
- Don’t you remember.....?
- Do you happen to remember it now?

Ways to respond:
- Let me think, yes, I remember.
- I remember especially the scenery.
- I’ll never forget that
- I’ll always remember.
- I can remember it clearly.

Informal expressions:
- Remember the old house we used to live in?
- Remember that?
- I’m sorry I don’t remember

Ways to respond:
- Hold on. Yes, got it!
- I know.....
- It’s coming back to me now.

Respond if you forget:
- Sorry, I’ve completely forgotten.
- I’m affraid I forget.
- I really can’t remember.
- I’m afraid I have no memory of him
- Errr, let me think. No, it’s gone.
- Sorry, it slipped off my mind.

Example..
It was Sunday morning, Dyra got dressed and had breakfast quickly. She was ready to leave for school. Her mother was a little puzzled.
Mother : Hey...hey.... are you going to school? 

Dyra: Yes, Mom. I overslept. I’m in a hurry
Mother : You remember Sunday, don’t you?'

Dyra : Oh, my goodnes. I thought it’s a school day !