Optics

©Written by Lovepreet Singh Grewal 

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1.What is the difference between a convex and a concave lens?

A) A convex lens is thicker in the middle and thinner at the edges, while a concave lens is thinner in the middle and thicker at the edges.

B) A convex lens is thinner in the middle and thicker at the edges, while a concave lens is thicker in the middle and thinner at the edges.

C) A convex lens is curved outward, while a con cave lens is curved inward.

D) A convex lens is curved inward, while a concave lens is curved outward.

 

2. How does the focal length of a lens affect the size of an image?

A) The larger the focal length, the larger the image.

B) The smaller the focal length, the larger the image

C) The larger the focal length, the smaller the image.

D) The smaller the focal length, the smaller the image.

 

3. What type of image is formed when an object is placed at a distance greater than twice the focal length from a convex lens?

A) Real and inverted

B) Real and upright

 C) Virtual and inverted

D) Virtual and upright

 

4. What is the primary advantage of using fiber optics for communication?

A) High bandwidth

B) Immunity to electromagnetic interference

C) Low attenuation

D) All of the above

 

5. What type of material is used in the core of an optical fiber?

A) Glass

B) Plastic

C) Silicon

D) Metal

 

6. What is the material used to make the cladding layer of an optical fiber?

A) Quartz

B) Silica

C) Fluorine-doped silica

D) All of the above L

 

7. What is the wavelength of light typically used in single mode fibers?

A) 650 nm

B) 850 nm

C) 1310 nm

D) 1550 nm

 

8. How is the signal strength of an optical fiber maintained over long distances?

 A) By using a high power laser

B) By using a low loss cladding material

C) By using a larger core diameter

D) By using optical amplifiers

 

9. What type of instrument uses a mirror to reflect light and create an image?

A) Telescope

 B) Microscope

C) Periscope

D) Binoculars

 

10. What type of instrument uses a combination of lenses to magnify an object? 

A) Telescope

B) Microscope

C) Periscope

D) Binoculars

 

11. What type of instrument uses a combination of mirrors to reflect light through a tube to a viewer?

A) Telescope

B) Microscope

C) Periscope

D) Binoculars

 

12. What is the function of the cornea in the human eye?

 A) To focus light on the retina

B) To produce tears and lubricate the eye

C) To produce the colour of the iris

 D) To protect the eye from external damage

 

13. What is the function of the pupil in the human eye?

A) To produce tears and lubricate the eye

B) To produce the colour of the iris

C) To control the amount of light entering the eye

D) To protect the eye from external damage

 

14. What is the function of the retina in the human eye?

A) To produce tears and lubricate the eye

B) To produce the colour of the iris

C) To control the amount of light entering the eye

D) To translate light into neural signals that are sent to the brain

 

15. What is the most common cause of near-sightedness (myopia)?

A) The eye is too long

B) The cornea is too curved

C) The lens is too thick

D) The retina is too sensitive

 

16. What is the most common cause of far-sightedness (hyperopia)?

A) The eye is too short

B) The cornea is too curved

C) The lens is too thin.

D) The retina is too sensitive

 

17. What is the common cause of astigmatism?

A) An irregular shaped cornea

B) An irregular shaped lens

C) An irregular shaped retina

 D) An irregular shaped pupil

 

18. What is the most common cause of cataracts?

A) Genetic predisposition

B) Trauma to the eye

C) Ageing

D) Exposure to UV radiation

 

19. What is the most common symptom of glaucoma?

A) Blurred vision

B) Loss of peripheral vision

C) Double vision

D) Eye pain

 

20. What is the most common symptom of dry eye syndrome?

A) Blurred vision

B) Loss of peripheral vision

C) Eye discomfort or irritation

D) Double vision

21. `which lens are used for  Myopia

A) Concave Lens

B) Convex lens

C) Cylindrical lens

D) Concave Mirror

22. which lens are used for  Hypermetropia

A) Concave Lens

B) Convex lens

C) Cylindrical lens

D) Concave Mirror

23. which lens are used for  Astigmatism

A) Concave Lens

B) Convex lens

C) Cylindrical lens

D) Concave Mirror

24. name the visible coloured portion of the human eye

A) Iris

B) Pupil

C) Cornea 

D) Retina

25. The type of cells found in retina are

A) Purkinje cells

B) Schwann cells

C) Neuroglial cells

D) Amacrine cells

Answer: D

26. The eye lens is

A) Concave

B) Convex

C) Biconcave

D) Biconvex

Answer: D

27. The persistence of vision for the human eye is

A) 1/6th of a second

B) 1/10th of a second

C) 1/16th of a second

D) 1/18th of a second

Answer: (c)

28. . What does the tapetum lucidum do?

A) it is the coloured part of the eye

B) gives animals night vision

C) transparent jelly-like fluid

D) it is the area where the optic never attaches

Answer: B

29. The innermost layer and the most delicate layer of the eyeball where the photoreceptors are located are

A) Chloroid

B) Sclera

C) Cornea

D) Retina

Answer: D

30. This part of the eye dilates and contracts based on the environment

A) Sclera

B) Cornea

C) Lens

D) Pupil

Answer: (d)

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