41. What is the name of the phenomenon where light waves bend around an obstacle?
a) Reflection
b) Refraction
c) Interference
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
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
44. What is the name of the phenomenon where light waves are separated into different colors?
a) Reflection
b) Refraction
c) Interference
d) Diffraction
45. What is the name of the instrument used to separate light into its component colors?
a) Prism
b) Lens
c) Mirror
d) Filter
