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G9 + 10 physics > unit 9.5 - Optics > Flashcards

unit 9.5 - Optics Flashcards

1
Q

2 types of mirror

A

Convex (curves outwards) and Concave (curves inward)

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2
Q

Centre of curvature

A

Midpoint of the sphere frm which the mirror has been obtained

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3
Q

Radius of Curvature

A

Radius of the sphere from which the mirror has been obtained

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4
Q

Optical centre

A

Midpoint of the reflecting surface

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5
Q

Principle axis

A

Imaginary line joining the Centre of curvature and the optical centre

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6
Q

Principle Focal point

A

Point located on the principle axis, in the middle of the optical centre and the centre of curvature, through which all reflected light ways pass through provided the incident ray are parallel to the principle axis

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7
Q

Focal length

A

Distance betwen the Focal Point and the Optical centre

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8
Q

Cases of incident light rays in concave

A
  1. Incident light ray pases parallel to the principle axis, then the reflected light ray goes through the Focal point
  2. Incident light ray pases through the focal point, then the reflected light ray pases parallel to the principle axis
  3. Incident light ray pases through the centre of curvature, then the reflecting light ray retraces the same path and goes through the centre of curvature as well
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9
Q

Concave mirror image formation: Object at Infinity (very high distance compared to focal length)

A

Image will be formed at Focal point
Nature = Real, inverted, point sized

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10
Q

Concave mirror image formation: Object at beyond Centre of curvature

A

Image will be formed between centre of curvature and Focal point
Nature = Real, Inverted, diminished in size

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11
Q

Concave mirror image formation: Object at Centre of curvature

A

Formed at centre of curvature itself
Nature = Real, Inverted, Same size

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12
Q

Concave mirror image formation: Object at between centre of curvature and focal point

A

Image will be beyond centre of curvature
Nature = Real, Inverted, enlarged

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13
Q

Concave mirror image formation: Object at Focal point

A

Image will be formed at infinity
Nature = Real, Inverted and highlighy enlarged

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14
Q

Concave mirror image formation: Object at between focal point and optical centre

A

No real image will be formed.
Virtual image will be formed on the other side of the mirror assuming the direction of incident lines

Nature = Virtual, Upright, Enlarged

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15
Q

how does a refracting telescope work?

A

An objective lens captures all the light rays coming from the planet and focuses it at one point (the end of focal length of that lens). Another convex lens is used as the eyepiece. The focal legnth of the eyepiece meets the focal length of the objective lens. The focused light rays then slowly spread back out and get enlarged and are deleivered to the eye

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16
Q

how does a reflecting telescope work?

A

Light rays hit a parabolic concave mirror with bounce of the mirro and hit a plain mirror at an angle. This plain mirror focuses the light for our eyes. The lights cross at the focal length of the eyepiece and gets delivered to the eyepiece lens, which is a convex lens. The eyepiece delivers the light parallel to our eyes, allowing for upright image viewing and better image quality

17
Q

cases of incident and reflected rays in convex mirrors

A
  1. Incident light ray parallel to the principle axis, then the reflected light ray passes through focal point on the other side
  2. Incident light ray pases through the focal point, reflected light ray passes parallel to the principle axis on th eother side of the mirror
  3. Incident light raya passes through the optical centre, the reflected light ray passes through without any deviation
18
Q

Convex mirror image formation: Object at infinity

A

Image is also at infinity
Nature = Real, Inverted and point sized

19
Q

Convex mirror image formation: Object at beyond focal length

A

Image at between focal point and 2F
Nature = Real, Inverted, Diminished

20
Q

Convex mirror image formation: Object at 2F

A

Image formed at 2F on the other side of mirror
Nature = Real, Inverted, Same size

21
Q

Convex mirror image formation: Object at between Focal point and 2F

A

Image at beyond 2F on other side of mirror
Nature = Real, Inverted and enlarged

22
Q

Convex mirror image formation: Object at Focal point

A

Image at inifnity on other side of mirror
Nature = Real, Inverted, Highly enlarged

23
Q

Convex mirror image formation: Object at Optical centre and Focal point

A

Image formed behind object on same side of mirror (imagined)

Nature = Virtual, Upright, Enlarged

G9 + 10 physics (8 decks)

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