Dispersion of Light Short Question With Answer: General Science Cadet College Test
Q.No.01: What is refraction?
Ans: Refraction is the bending of light when it passes from one transparent material to another.
Q.No.02: When does light not change its direction?
Ans: When light falls straight (perpendicular) on a surface, it does not change direction.
Q.No.03: What are two effects of refraction?
Ans: Rainbow is formed.
Eyes form images on the retina using refraction.
Eyes form images on the retina using refraction.
Q.No.04: When is the angle of refraction greater than the angle of incidence?
Ans: When light moves from water or glass to air, it bends away from the normal. Then, the angle of refraction becomes greater than the angle of incidence.
Q.No.05: What is incident and refracted ray?
Ans: Incident Ray: Light ray that hits the surface.
Refracted Ray: Light ray that bends in the second material.
Refracted Ray: Light ray that bends in the second material.
Q.No.06: What is the difference between angle of incidence and angle of refraction?
Ans: Angle of incidence is the angle between the incoming light and the normal line.
Angle of refraction is the angle between the bent light and the normal line.
Angle of refraction is the angle between the bent light and the normal line.
Q.No.07: What is refractive index?
Ans: It tells how much a material can bend light.
Q.No.08: What is critical angle?
Ans: The smallest angle of incidence at which light bends 90° is called the critical angle.
Q.No.09: What is total internal reflection?
Ans: When light hits the surface at an angle greater than the critical angle, it reflects back into the same material.
Q.No.10: What is a prism?
Ans: A prism is a glass block with 3 rectangle and 2 triangle surfaces. It has one 90° and two 45° angles.
Q.No.11: Why does a pencil look bent in water?
Ans: Light from the pencil bends as it moves from water to air, making the pencil appear bent.
Q.No.12: How does refraction help in lenses?
Ans: Lenses use refraction to bend light rays and focus them to form images.
Q.No.13: What happens to light speed during refraction?
Ans: Light changes speed; it slows down in denser materials and speeds up in less dense materials.
Q.No.14: Why do stars appear to twinkle?
Ans: Light from stars bends as it passes through layers of air with different densities, causing the twinkling effect.
Q.No.015: What is dispersion of light?
Ans: Dispersion is the splitting of white light into its colors when it passes through a prism.
Q.No.16: Which color bends the most in refraction?
Ans: Violet light bends the most because it has the shortest wavelength.
Q.No.17: Why can we see the bottom of a pool more clearly than its actual depth?
Ans: Refraction makes the bottom appear closer to the surface than it really is.
Q.No.018: How does refraction work in a magnifying glass?
Ans: The curved lens bends light rays to make objects appear larger.
Q.No.19: Why do fish look closer in water than they are?
Ans: Refraction bends light from the fish toward your eyes, making it seem nearer.
Q.No.20: How does refraction cause mirages?
Ans: Hot air near the ground bends light upward, making distant objects appear like they are reflected in water.
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