Angle between incident and reflected rays is twice the angle of incidence

Steps:

• Initial angle of incidence is 20°.
• New angle of incidence is 20° + 5° = 25°.
• Angle of reflection equals angle of incidence, so 25°.
• Angle between rays is 2 × 25° = 50°.

Why D is correct:

• Law of reflection states angle of incidence equals angle of reflection; the angle between the rays is twice this value, yielding 2 × 25° = 50°.

Why the others are wrong:

• A: 10° is twice the change in incidence, not the total angle.
• B: 25° is the new incidence angle, ignoring the doubling.
• C: 45° might result from adding original 2i (40°) and change (5°), a misapplication.

Final answer: D