# Light And Optics Unit Quiz Test

15 Questions | Total Attempts: 259  Settings  Related Topics
• 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.

• 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