A telescope is an optical instrument designed to make distant objects like stars, planets, appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.

Answer the following questions and arrange the letters you get inside the coloured boxes in the order given below the questions to spell out the name of a famous bacteriologist. Instrument required to view microbes- Amoeba divides by _____ fission. Chlorella propagates by producing special cells called _____. An organism that lives on or within the bodies of other organisms, affecting them adversely _____. A viral disease- Yeast has a cell wall made of _____. The name is

Instrument required to view microbes is known as a microscope. It is made up of magnifying lens where the tiny microbes which are naked to our eyes are observed in this. Amoeba is a unicellular eukaryotic organism. It is irregular in shape and reproduces through an asexual reproductive method called binary fission. Chlorella is a unicellular green alga which is seen in stagnant water or in soils rich in organic matter. A thin cell wall encloses a single cup-shaped chloroplast and a centrally placed nucleus. These reproduce by forming special cells called spores. An organism that lives on or within the bodies of other organisms, affecting them adversely is parasites. Viruses are one of the types which require a host body to replicate and to survive. Viruses are the intracellular obligate parasites which are active inside the host body. These causes diseases like AIDS, mumps, chickenpox, poliovirus, etc. Chickenpox is also known as varicella, is a highly contagious disease caused by the Varicella zoster virus. Yeast is unicellular eukaryotic fungi. These are reproduced by the budding method. Yeast cells are oval in shape with the prominent vacuole, a nucleus, mitochondria and stored food in the form of glycogen. The body is made up of a hard layer called chitin. The identified scientist name is Robert Koch. He was well known in microbiology. He was the one who discovered the bacteria that causes anthrax ( Bacillus anthracis ), septicaemia, tuberculosis, etc.

EASY

Earn 100

Explain the image formation of the compound microscope.

Important Questions on Optics

EASY

Science>Physics>Optics>Optical Instruments

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

EASY

Science>Physics>Optics>Optical Instruments

Mention any two achievements of Hubble Telescope.

EASY

Science>Physics>Optics>Optical Instruments

In an astronomical telescope focal lengths of the two lenses are

0.3 m

and

0.05 m

. In normal adjustment the distance between them is.

EASY

Science>Physics>Optics>Optical Instruments

For the astronomical telescope, the focal length of objective lens is

f_{0}

and the eye piece lens is

f_{e} .

Then the tube length of the telescope is _______.

EASY

Science>Physics>Optics>Optical Instruments

For testing of blood _____ is used.

MEDIUM

Science>Physics>Optics>Optical Instruments

Question Image

The image is magnified x 400. What does this mean?

EASY

Science>Physics>Optics>Optical Instruments

Lana is looking at a book with a picture of E. coli bacteria. The bacteria in the image are magnified

\times

10 000. What does this mean?

EASY

Science>Physics>Optics>Optical Instruments

List the uses of a simple microscope.

MEDIUM

Science>Physics>Optics>Optical Instruments

Draw a ray diagram to illustrate the action of a convergent lens as reading glasses or a magnifying glass.

EASY

Science>Physics>Optics>Optical Instruments

Microorganisms can be seen with the help of a _____.

HARD

Science>Physics>Optics>Optical Instruments

What is a telescope?

MEDIUM

Science>Physics>Optics>Optical Instruments

Why was an electron microscope been used and not a light microscope?

EASY

Science>Physics>Optics>Optical Instruments

To see distant object _____ lens is used.

EASY

Science>Physics>Optics>Optical Instruments

Microorganisms are very small. Name the piece of apparatus needed to view microorganisms.

MEDIUM

Science>Physics>Optics>Optical Instruments

Draw a ray diagram to illustrate the action of a convex lens as magnifying glass.

EASY

Science>Physics>Optics>Optical Instruments

Give a one-word answer:

What piece of apparatus do you need to study microorganisms?

MEDIUM

Science>Physics>Optics>Optical Instruments

Answer the following questions and arrange the letters you get inside the coloured boxes in the order given below the questions to spell out the name of a famous bacteriologist.

Instrument required to view microbes-
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