41. What is the name of the phenomenon where light waves bend around an obstacle?
a) Reflection
b) Refraction
c) Interference
d) Diffraction
Answer: d) Diffraction
42. What is the name of the type of lens that is thicker in the middle than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: a) Convex lens
43. What is the name of the type of lens that is thinner in the middle than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: b) Concave lens
44. What is the name of the phenomenon where light waves are separated into different colors?
a) Reflection
b) Refraction
c) Interference
d) Diffraction
Answer: b) Refraction
45. What is the name of the instrument used to separate light into its component colors?
a) Prism
b) Lens
c) Mirror
d) Filter
Answer: a) Prism
