Light And Optics Unit Quiz Test

15 Questions | By Moustafaelrefaay | Last updated: Mar 22, 2022 | Total Attempts: 2016

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Take this simple multiple choice questions for light and optics unit and learn more about it!

Questions and Answers

1.

A survivor from a ship wreck sees an image of a fish in the water. To catch it with her spear, she must
- A.
  
  Aim above the image of the fish
- B.
  
  Aim below the image of the fish
- C.
  
  Aim at the image of the fish
- D.
  
  Aim behind the fish
- E.
  
  Put away the spear and use a fishing rod
2.

A light ray has an angle of incidence of 34º. The reflected ray will make what angle with the reflecting surface?
- A.
  
  0º
- B.
  
  34º
- C.
  
  56º
- D.
  
  66º
- E.
  
  74º
3.

The critical angle for diamond (n = 2.42) submerged in water (n = 1.33) is
- A.
  
  33°
- B.
  
  49°
- C.
  
  24°
- D.
  
  17°
- E.
  
  Does not exist
4.

Calculate the index of refraction for an object in which light travels at 1.97 x 10⁸ m/s.
- A.
  
  1.97 m/s
- B.
  
  0.66 m/s
- C.
  
  1.52 m/s
- D.
  
  1.95
- E.
  
  1.52
5.

The critical angle of zircon is 31°. Which of the following incident angles would result in total internal reflection?
- A.
  
  17°
- B.
  
  34°
- C.
  
  42°
- D.
  
  A and C
- E.
  
  B and C
6.

When a light ray travelling in glass is incident on an air surface,
- A.
  
  It will refract away from the normal
- B.
  
  Some of the light may be reflected
- C.
  
  All of the light may be reflected
- D.
  
  All of A, B, and C
- E.
  
  Two of A, B, and C
7.

Light travels from medium X into medium Y. Medium Y has a higher index of refraction. Consider each statement below:(i) The light travels faster in X. (ii) The light will bend towards the normal. (iii) The light will speed up. (iv) The light will bend away from the normal.
- A.
  
  (ii)
- B.
  
  (iii) and (iv)
- C.
  
  (i)
- D.
  
  (i) and (ii)
- E.
  
  (ii), (iii), and (iv)
8.

For a converging lens, a light ray that is travelling parallel to the principal axis refracts
- A.
  
  Through the principal focus
- B.
  
  Through the secondary focus
- C.
  
  Through the optical centre
- D.
  
  Parallel to the principal axis
- E.
  
  In line with the principal focus
9.

A object is placed between f and 2f for a diverging lens. The image will be located
- A.
  
  Between f and 2f
- B.
  
  Between the lens and f
- C.
  
  Farther than 2f
- D.
  
  A or B
- E.
  
  There is insufficient information to answer the question.
10.

Light that travels into the eye passes through several parts to get to the retina. The correct order is
- A.
  
  Cornea, vitreous humour, lens, pupil
- B.
  
  Lens, cornea, pupil, vitreous humour
- C.
  
  Cornea, lens, pupil, vitreous humour
- D.
  
  Pupil, cornea, lens, vitreous humour
- E.
  
  Cornea, pupil, lens, vitreous humour
11.

The proper name for the inability to focus in different planes is
- A.
  
  Hyperopia
- B.
  
  Presbyopia
- C.
  
  Astigmatism
- D.
  
  Myopia
- E.
  
  Glaucoma
12.

The proper name for farsightedness is
- A.
  
  Hyperopia
- B.
  
  Presbyopia
- C.
  
  Astigmatism
- D.
  
  Myopia
- E.
  
  Glaucoma
13.

A block of glass is pushed into the path of the light, as shown below.The point where the light rays cross will
- A.
  
  Stay in the same place
- B.
  
  Move to the left
- C.
  
  Move to the right
- D.
  
  Shift up
- E.
  
  Shift down
14.

The focal length of a converging lens is 15 cm. An object is placed 45 cm away from the lens. The image will be
- A.
  
  Smaller and real
- B.
  
  Larger and real
- C.
  
  The same size and real
- D.
  
  Smaller and virtual
- E.
  
  Larger and virtual
15.

The focal length of a diverging lens is 12 cm. An object is placed 5.0 cm away from the lens. The image will be
- A.
  
  Smaller and real
- B.
  
  Larger and real
- C.
  
  The same size and real
- D.
  
  Smaller and virtual
- E.
  
  Larger and virtual