1. What phenomenon causes a rainbow to form?
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: b) Refraction
2. Which part of the eye is responsible for focusing light onto the retina?
a) Cornea
b) Iris
c) Lens
d) Pupil
Answer: c) Lens
3. When light travels from air into water, what happens to its speed?
a) It increases
b) It decreases
c) It remains constant
d) It doubles
Answer: b) It decreases
4. What type of lens is used to correct farsightedness (hyperopia)?
a) Concave Lens
b) Convex Lens
c) Biconcave Lens
d) Biconvex Lens
Answer: b) Convex Lens
5. What causes the colors in a rainbow?
a) Diffraction
b) Interference
c) Dispersion
d) Reflection
Answer: c) Dispersion
6. In optics, what does the term “refraction” refer to?
a) Bending of light as it passes through different media
b) Bouncing of light off a surface
c) Spreading of light waves around obstacles
d) Absorption of light by a material
Answer: a) Bending of light as it passes through different media
7. Which of the following is NOT a type of lens?
a) Convex
b) Concave
c) Biconcave
d) Biconvex
Answer: c) Biconcave
8. What causes the “redshift” observed in the light from distant galaxies?
a) Light scattering
b) Light absorption
c) Doppler Effect
d) Reflection
Answer: c) Doppler Effect
9. What is the primary cause of the blue color of the sky?
a) Scattering of sunlight by atmospheric particles
b) Absorption of sunlight by the atmosphere
c) Reflection of ocean water
d) Emission from the sun
Answer: a) Scattering of sunlight by atmospheric particles
10. What is the critical angle in optics?
a) The angle at which light reflects fully back into a medium
b) The angle at which light passes through a lens
c) The angle at which light begins to scatter
d) The angle at which light is absorbed
Answer: a) The angle at which light reflects fully back into a medium
11. How does a concave mirror affect parallel rays of light?
a) It diverges them
b) It converges them
c) It absorbs them
d) It scatters them
Answer: b) It converges them
12. Which type of lens would you use to correct nearsightedness (myopia)?
a) Convex Lens
b) Concave Lens
c) Biconvex Lens
d) Biconcave Lens
Answer: b) Concave Lens
13. What is the purpose of the pupil in the human eye?
a) To focus light on the retina
b) To adjust the amount of light entering the eye
c) To detect color
d) To produce tears
Answer: b) To adjust the amount of light entering the eye
14. What is the result of the refraction of light in a prism?
a) Dispersion of light into a spectrum
b) Reflection of light into different directions
c) Absorption of specific colors
d) Scattering of light into a mist
Answer: a) Dispersion of light into a spectrum
15. What is the phenomenon called when light bends around the edge of an object?
a) Reflection
b) Refraction
c) Diffraction
d) Absorption
Answer: c) Diffraction