4. Which of the following are the correct reasons why we see a clear image of our face when we look on
the mirror?
l. A mirror has plane and smooth surface.
II. Incident light rays to a mirror get diffracted when it strikes a mirror.
II. Incident light rays to the mirror get refracted on the surface of mirror.
IV. Incident light rays to a mirror get reflected when it strikes on plane surface.
A. I and II only
B. I and Ill only
C. I and IV only D. III and IV only
5. According to Louis de Broglie, why is light said to have a dual nature?
A. It shows the properties of wave only.
B. It exhibits the properties of reflection.
C. It has both interference and polarization effect.
D. It displays the properties of both wave and particle.
6. Who among the scientists below formulated the wave theory of light?
A. Isaac Newton
C. Christian Huygens
B. Louis de Broglie
D. James Clerk Maxwell
7. Which of the following is NOT a property of light?
A. Direction
B. Frequency
C. Intensity
D. Width
8. Which of the following materials would reflect light the most?
A. black rock
C. flat sheet of aluminum foil
B. dark brown carpet
D. piece of red construction paper
9. When you look in a mirror, which of the following will cause formation of an image?
A. Absorption
B. Reflection
C. Refraction
D. Transmission
10. Which of these examples inside the box are natural sources of light?
1. Sun, moon, stars, and fire
II. Sun, stars, lightning, fire, and fireflies
III. Sun, lightning, and incandescent bulb.
IV. Fire, lightnina, candle, stars, and fireflies
A. I & ll only
B. Il & Ill only
C. l, ll & Ill only
D. I, II, III and II​