Among these which is not a rule of sign convention?

Measure all distances from centre of curvature

The distance in light travelling direction is positive

Distance in opposite direction is negative

Measure all distances from (Pole)

MONTESSORI OLYMPUS SCHOOL QUIZ

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| By PRASHANTH

PRASHANTH

Community Contributor

Quizzes Created: 1 | Total Attempts: 49

Questions: 10 | Attempts: 49 | Updated: Apr 19, 2023

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Topic : Light Prepared by N. Prashanth (Physics Teacher-7396328685)

Questions and Answers

1.

According to fermat principle, the route which light travel from A to B
- A.
  
  Route 2
- B.
  
  Route 1
- C.
  
  Route 4
- D.
  
  Route 3
Correct Answer
B. Route 1

Explanation
According to Fermat's principle, light travels along the path that takes the least time. Therefore, Route 1 must be the correct answer as it is the route that allows light to travel from point A to point B in the shortest amount of time compared to the other routes.

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2.

From this figure i =
- A.
  
  50⁰
- B.
  
  90⁰
- C.
  
  40⁰
- D.
  
  180⁰
Correct Answer
C. 40⁰
3.

From this figure the principal axis is
- A.
  
  AR
- B.
  
  AC
- C.
  
  AP
- D.
  
  PC
Correct Answer
D. PC

Explanation
The correct answer is PC because in the figure, PC represents the line passing through the principal focus (P) and the center of curvature (C). The principal axis is defined as the line passing through the center of curvature and the principal focus of a lens or mirror. Therefore, PC is the correct choice for the principal axis in this figure.

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4.
1. By extension of reflected rays we can get ___________ image
- A.
  
  Virtual Image
- B.
  
  Real Image
- C.
  
  Inverted Image
- D.
  
  No image
Correct Answer
A. Virtual Image

Explanation
By extension of reflected rays, we can determine the path that the light rays would have taken if they were actually coming from a specific point. In the case of a virtual image, the rays of light do not actually converge at a point, but they appear to diverge from a point behind the mirror or lens. This means that the image formed is not real and cannot be projected onto a screen. Therefore, the correct answer is "Virtual Image."

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5.

Among these which is not a rule of sign convention?
- A.
  
  Measure all distances from centre of curvature
- B.
  
  The distance in light travelling direction is positive
- C.
  
  Distance in opposite direction is negative
- D.
  
  Measure all distances from (Pole)
Correct Answer
A. Measure all distances from centre of curvature

Explanation
The rule of sign convention states that distances measured in the direction of light travel are positive, while distances measured in the opposite direction are negative. However, measuring all distances from the centre of curvature is not a rule of sign convention.

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6.

If radius of curvature of a spherical mirror (R) = 14cm them the focal length =____________
- A.
  
  28 cm
- B.
  
  35 cm
- C.
  
  7 cm
- D.
  
  21 cm
Correct Answer
C. 7 cm

Explanation
The focal length of a spherical mirror is equal to half of the radius of curvature. In this case, the radius of curvature is given as 14 cm, so the focal length would be 7 cm.

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7.

Focal laugh (f) =-15cm object distence (u) = -25cm height of the object (ho) = +4cm then the image is
- A.
  
  Enlarged
- B.
  
  Inverted
- C.
  
  Both Enlarged & Inverted
- D.
  
  None of these
Correct Answer
C. Both Enlarged & Inverted

Explanation
When the object distance (u) is negative, it indicates that the object is placed on the same side as the observer. A negative focal length (f) indicates a concave lens, which causes the image to be real and inverted. The positive height of the object (ho) suggests that the object is above the principal axis. Combining these factors, the image formed will be both enlarged and inverted.

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8.

In mirrors the virtual image is formed when the object is at _____________
- A.
  
  Focus
- B.
  
  between pole and focus
- C.
  
  At centre of curvature
- D.
  
  Beyond the centre of curvature
Correct Answer
B. between pole and focus

Explanation
When an object is placed between the pole and the focus of a mirror, a virtual image is formed. This virtual image appears to be located behind the mirror and is always upright.

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9.

The image of an object in pinhole camera is ________________
- A.
  
  Erect
- B.
  
  Inverted
- C.
  
  Diminished
- D.
  
  Plain
Correct Answer
B. Inverted

Explanation
In a pinhole camera, the image of an object is inverted. This is because light rays from the object pass through a small hole (pinhole) and form an inverted image on the opposite side of the camera. This phenomenon is a result of the way light rays interact with the pinhole and the principles of optics.

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10.

In plane mirrors, right - left inversion of image is called
- A.
  
  Inverse
- B.
  
  Reverse
- C.
  
  Lateral Inverse
- D.
  
  Same side
Correct Answer
C. Lateral Inverse

Explanation
The correct answer is "Lateral Inverse." In plane mirrors, the phenomenon where the right side of an object appears as the left side in the reflected image is known as lateral inversion. This occurs because the mirror reverses the direction of light rays, causing the image to appear laterally inverted compared to the actual object.

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