Geometrical Optics Flashcards

1
Q

What is a lens ?

A

A piece of Transparent material that can focus a transmitted beam of light

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2
Q

What are two types of lenses ?

A

🥱convex / converging lens

🥱 diverging/ concave lens

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3
Q

The point f to which the rays are brought to focus is called?

A

Principal focus or focal point

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4
Q

Distance between optical centre and its principle focus is called

A

Focal length

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5
Q

Convex lens gives

A

Real image

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6
Q

Concave gives

A

Virtual images

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7
Q

Real Images are always ?

A

Inverted

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8
Q

Virtual images are always ?

A

Errect

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9
Q

What is Visual angle ?

A

The apparent size of the object depends upon angle substanted by the eye

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10
Q

Least distance of distinct vision is?

A

25cm

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11
Q

A type of convex lens which brings object closer is called ?

A

Magnifying 🔍 glass

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12
Q

An optical instrument which is used to see small object with very high magnification is called ?

A

Compound microscope 🔬

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13
Q

Image formed by compound microscope is ?

A

Virtual and very much magnified

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14
Q

Optical instrument used to see distant object and heavenly bodies that is planets and stars is called ?

A

Astronomical telescope

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15
Q

Image formed by astronomical telescope is ?

A

Highly magnified / inverted / virtual

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16
Q

Distance between objective and eye piece 🧩 is called ?

A

Length of telescope 🔭

17
Q

An instrument used to see objects on earth is called

A

Galilean Telescope

18
Q

Instrument which is used to study the spectrum of luminous bodies is called?

A

Spectrometer

19
Q

The front of eye is covered by transparent membrane called?

A

Cornea

20
Q

Muscular diaphragm that control the size of pupil ?

A

Iris

21
Q

When images formed behind retina … The Abnormality is ?

A

✓ Myopia ( far sighted )

✓corrected by using converging lens

22
Q

When image is formed Infront of retina … The Abnormality is known as ?

A

✓Hyperopia or short sightedness

✓ corrected by using diverging lens

23
Q

Bright sunlight is an example of ?

A

Convex lens

24
Q

When the magnification of a lens is less than 1 , it means the image is actually :

A

M(Dec) q (Dec )

Smaller than obj

25
Q

Smaller the distance of object from the eye 👁️ the visual angle will be ?

A

Visual angle ( inc ) distance (Dec)

Greater

26
Q

Linear magnification produced by a lens is defined as :

A

The ratio of size of image to size of object