Q1) Which of the following phenomena causes a rainbow to form?

A) Reflection

B) Refraction

C) Dispersion

D) Diffraction

Q2) What is the unit of measurement for the focal length of a lens?

A) Meters

B) Inches

C) Diopters

D) Millimeters

Q3) When light passes from air into glass, what generally happens to its speed?

A) Increases

B) Decreases

C) Remains constant

D) Reverses direction

Q4) Which type of lens is used to correct farsightedness?

A) Convex lens

B) Concave lens

C) Plano-concave lens

D) Plano-convex lens

Q5) In which medium does light travel fastest?

A) Air

B) Water

C) Glass

D) Diamond

Q6) What type of mirror is commonly used in headlights of cars?

A) Convex mirror

B) Concave mirror

C) Plane mirror

D) Spherical mirror

Q7) Which law of refraction states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for a given pair of media?

A) Snell's law

B) Brewster's law

C) Huygens' principle

D) Newton's law

Q8) What term refers to the ability of a lens to bend light?

A) Dispersion

B) Refraction

C) Reflection

D) Diffraction

Q9) Which color of light bends the most when passing through a prism?

A) Red

B) Blue

C) Green

D) Violet

Q10) What type of image is formed when the object is placed between the focal point and the lens of a convex lens?

A) Real and inverted

B) Real and upright

C) Virtual and inverted

D) Virtual and upright

Q11) Which of the following is not a type of optical aberration?

A) Chromatic aberration

B) Spherical aberration

C) Astigmatism

D) Diffraction

Q12) What is the phenomenon where light spreads out as it passes through a small aperture or around the edge of an object?

A) Dispersion

B) Reflection

C) Refraction

D) Diffraction

Q13) Which of the following statements about a concave lens is true?

A) It converges parallel rays of light.

B) It has a positive focal length.

C) It always forms a virtual image.

D) It diverges parallel rays of light.

Q14) The critical angle for a given pair of media depends on what?

A) The refractive index of the first medium only

B) The refractive index of the second medium only

C) The angle of incidence

D) The refractive indices of both media

Q15) What type of mirror is typically used in makeup mirrors to produce an upright, magnified image?

A) Convex mirror

B) Concave mirror

C) Plane mirror

D) Spherical mirror

Q16) What is the phenomenon where a wave changes direction as it passes from one medium to another?

A) Diffraction

B) Dispersion

C) Reflection

D) Refraction

Q17) Which of the following is not a primary color of light?

A) Red

B) Yellow

C) Blue

D) Green

Q18) What type of lens is used to correct nearsightedness?

A) Convex lens

B) Concave lens

C) Plano-concave lens

D) Plano-convex lens

Q19) What is the phenomenon where parallel rays of light converge to a point after passing through a lens?

A) Dispersion

B) Diffraction

C) Reflection

D) Focusing

Q20) What type of mirror is commonly used in security mirrors to provide a wide field of view?

A) Convex mirror

B) Concave mirror

C) Plane mirror

D) Spherical mirror