MCQs of Refraction of light and Optical Instrument of Chapter 14 of Class X
1. Which ray emerges after refraction of light
(a) Reflected Ray
(b) Refracted Ray
(c) Incident Ray
(d) None of These
2. The ray which strikes the surface is called
(a) Reflected Ray
(b) Refracted Ray
(c) Incident Ray
(d) None of These
3. The ratio between velocity of light in air and velocity of light in medium is called
(a) Reflection
(b) Refraction
(c) Infraction
(d) Refractive Index
4. The angle formed between normal and refracted ray is called
(a) Reflected Angle
(b) Refracted Angle
(c) Incident Angle
(d) None of These
5. The angle formed between normal and incident ray is called
(a) Reflected Angle
(b) Refracted Angle
(c) Incident Angle
(d) None of These
6. The ray which passed through the medium after refraction of light is called
(a) Reflected Ray
(b) Refracted Ray
(c) Incident Ray
(d) None of These
7. The incident ray refracted ray and normal all lie in which plane
(a) Same
(b) Different
(c) Every
(d) None of These
8. The ratio of the sine of the incidence angle to the sine of the refracted angle is
(a) Same
(b) Different
(c) Constant
(d) None of These
9. The angle of incidence for which the angle of refraction is 90⁰ is called
(a) Reflected Angle
(b) Refracted Angle
(c) Incident Angle
(d) Critical Angle
10. The laws of refraction can be verified by using
(a) Prism
(b) Plane Glass
(c) Glass Slab
(d) None of These
11. A transparent refracting body whose three sides are rectangle and two are triangle is known as
(a) Prism
(b) Plane Glass
(c) Glass Slab
(d) None of These
12. An optical illusion due to internal Reflection of light is
(a) Persistence
(b) Mirage
(c) Refractive Index
(d) Critical Angle
13.The image of an object is retained for about 1/10 sec in our eyes after removal , it is known as
(a) Persistence Vision
(b) Mirage
(c) Reflecting Prism
(d) Total Internal Reflection
14. Convex lens is called a
(a) Diverging Lens
(b) Converging Lens
(c) Reflective Lens
(d) Converging Lens
15. Concave lens is called a
(a) Diverging Lens
(b) Converging Lens
(c) Reflective Lens
(d) Converging Lens
16. The reciprocal of focal length is called
(a) Power of Lens
(b) Optical Centre
(c) Principal Axis
(d) Refractive Index
17. Convex lens is called a
(a) Diverging Lens
(b) Converging Lens
(c) Reflective Lens
(d) Converging Lens
18. The diameter of the lens is called
(a) Power
(b) Mirage
(c) Axis
(d) Aperture
19. In photographic camera, a convex lens is used because it produces the following image
(a) Real and Small
(b) Real and Large
(c) Virtual and Small
(d) Virtual and large
20. Laws of refraction is discovered by
(a) Ibne-al-Haitham
(b) Newton
(c) Al-Beruni
(d) Coloumb
21. In case of concave mirror , the image formed is always
(a) Real
(b) Large
(c) Positive
(d) Virtual
22. In case of convex mirror , the image formed is always
(a) Real
(b) Large
(c) Positive
(d) Virtual
23. A lens whose center is thinner than its edges is called
(a) Convex Lens
(b) Concave Lens
(c) Double Concave Lens
(d) Plano Convex Lens
24. A lens whose thickness at the center is greater than at edges is called
(a) Convex Lens
(b) Concave Lens
(c) Double Concave Lens
(d) Plano Convex Lens
25. One dioptre is the power of the lens whose focal length is equal to
(a) 0.5 metre
(b) 1 metre
(c) 2 metre
(d) 10 metre
26. The distance between the optical centre and the principal focus of a lens is known as its
(a) Focal length
(b) Optical Centre
(c) Principal Axis
(d) Power in diopter
27. The S.I unit of power of lens is
(a) metre
(b) centimetre
(c) Watt
(d) dioptre
28. The power of lens of is the reciprocal of its
(a) Focal length
(b) Focus
(c) Axis
(d) Power
29. Short sightedness is removed by using a
(a) Convex Lens
(b) Concave Lens
(c) Contact Lens
(d) Plane Lens
30. Long sightedness is removed by using a
(a) Convex Lens
(b) Concave Lens
(c) Contact Lens
(d) Plane Lens
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