100+ Light Reflection and Refraction Class 10 MCQ and Answers

These Light Reflection and Refraction Class 10 MCQ and Answers are the most important part of Class 10 NCERT Science Text Book. We already published More standard MCQs on Light Reflection and Refraction –

Light Reflection and Refraction Class 10 MCQ

1. Which of the following statements is true?

a) A convex lens has 4 dioptre power having a focal length 0.25 m

b) A convex lens has -4 dioptre power having a focal length 0.25 m

c) A concave lens has 4 dioptre power having a focal length 0.25 m

d) A concave lens has -4 dioptre power having a focal length 0.25 m.

2. Magnification produced by a rear view mirror fitted in vehicles

a) is less than one

b) is more than one

c) is equal to one

d) can be more than or less than one depending upon the position of the object in front of it.

3. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

a) 15 cm in front of the mirror

b) 30 cm in front of the mirror

c) between 15 cm and and 30 cm in front of the mirror

d) more than 30 cm in front of the mirror

4. A full length image of a distant tall building can definitely be seen by using

a) a concave mirror

b) a convex mirror

c) a plane mirror

d) both concave as well as plane mirror

5. In torches, search lights and headlights of vehicles the bulb is placed

a) between the pole and the focus of the reflector

b) very near to the focus of the reflector

c) between the focus and centre of curvature of the reflector

d) at the centre of curvature of the reflector

6. The laws of reflection hold good for

a) plane mirror only

b) concave mirror only

c) convex mirror only

d) all mirrors irrespective of their shape

7. Identify the factor on which the angle of deviation of the prism does not depend.

a) The angle of incidence

b) The material of the prism

c) The angle of reflection

d) The wavelength of light used

8. What happens to the frequency and the wavelength when light passes from a rarer to a denser medium?

a) Wavelength remains unchanged but frequency changes

b) They are independent

c) Wavelength and frequency changes

d) Wavelength changes but the frequency remain unchanged

9. What is the relative refractive index of water with respect to glass?

a) Unity

b) More than unity

c) Less than unity

d) Zero

a) White

b) Dark

c) Blue

d) Pink

11. On what factor does the normal shift through a refracting medium depend?

a) The thickness of the refracting medium

b) Angle of Prism

c) Angle of deviation

d) Convection

12. A lens immersed in a transparent liquid is not visible. Under what condition can this happen?

a) Less refractive index

b) Higher refractive index

c) Same refractive index

d) Total internal reflection is zero

13. What is the cause of the blue color of the ocean?

a) Reflection

b) Scattering of light by water molecules

c) Total internal reflection

d) Refraction

14. What causes haloes (rings) around the sun or the moon?

a) Total internal reflection

b) Refraction of light

c) Reflection of light

d) Dispersion

15. Why is the sequence of colors in the secondary rainbow reverse of that in the primary rainbow?

a) Refraction of light

b) Two internal reflection

c) Reflection of light

d) Dispersion

16. Which of the following is a necessary condition for total internal reflection?

a) The angle of incidence in the denser medium must be greater than the critical angle for the two media

b) The angle of incidence in the rarer medium must be greater than the critical angle for the two media

c) The angle of incidence in the denser medium must be lesser than the critical angle for the two media

d) The angle of reflection in the denser medium must be greater than the critical angle for the two media

a) Black

b) Orange

c) Blue

d) Red

18. ‘X’ is an optical illusion observed in deserts or over hot extended surfaces like a coal-tarred road, due to which a traveler sees a shimmering pond of water some distance ahead of him and in which the surrounding objects like trees appear inverted. Identify X.

a) Mileage

b) Mirage

c) Optical activity

d) Total internal reflection

19. Identify the principle behind the sparkling of diamonds.

a) Total internal reflection

b) Refraction

c) Reflection

d) Optical activity

a) 2

b) 3

c) 4

d) 5

21. Which among the following is a portion of a transparent refracting medium bound by one spherical surface and the other plane surface?

a) Concave mirror

b) Plane mirror

c) Lens

d)Prism

22. X is thicker in the middle than at the edges, whereas, Y is thicker at the edges than in the middle. Identify ‘X’ and ‘Y’.

a) X = concave lens; Y = convex lens

b) X = convex lens; Y = concave lens

c) X = plane lens; Y = convex lens

d) X = concave lens; Y = plane lens

a) 2

b) 3

c) 4

d) 5

a) 12 cm

b) 40 cm

c) 13 cm

d) 0.075

a) 0.014 cm

b) 0.715 cm

c) 0.14 cm

d) 71.5 cm

a) Watts

b) Unit less

c) Diopter

d) Joule

27. According to the thin lens formula, which one of the following is true regarding the focal length of the lens?

a) f is positive for concave lens

b) f is negative for convex lens

c) f is positive for a diverging lens

d) f is negative for concave lens

28. What is the angle between the incident ray and the emergent ray in a prism called?

a) Angle of deviation

b) Angle of refraction

c) Angle of reflection

d) Angle of dispersion

29. What is the difference in a deviation between any two colors called?

a) Linear dispersion

b) Angular dispersion

c) Mean deviation

d) Mean dispersion

a) 0.0096

b) 0.45

c) 0.96

d) 0.096

a) 3o

b) 0o

c) 1o

d) 2o

a) Kerosene

b) Water

c) Mustard oil

d) Glycerine

33. A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.

a) Plane, convex and concave

b) Convex, concave and plane

c) Concave, plane and convex

d) Convex, plane and concave

34. In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

a) Concave mirror only

b) Convex mirror only

c) Convex lens only

d) Concave mirror, convex mirror, concave lens and convex lens

a) Water

b) Air

c) Glass

d) Diamond

36. The mirror having reflection surface curved outward

a) plane mirror

b) concave mirror

c) convex mirror

d) cylindrical mirror

37. The mirror having reflecting surface curved inwards

a) plane mirror

b) convex mirror

c) cylindrical mirror

d) concave mirror

38. The mirror used as rear-view mirror in vehicles

a) convex mirror

b) plane mirror

c) cylindrical mirror

d) concave mirror

a) reflection

b) refraction

c) dispersion

d) scattering

40. Convex lens is also known as

a) converging lens

b) diverging lens

d) axial lens

a) real image

b) virtual image

c) blue image

d) partial image

42. Which of the following can make a parallel beam of light when light from a point source is incident on it?

a) Concave mirror as well as convex lens

b) Convex mirror as well as concave lens

c) Two plane mirrors placed at 90° to each other

d) Concave mirror as well as concave lens

a) -30 cm

b) -20 cm

c) -40cm

d) -60 cm

44. Under which of the following conditions a concave mirror can form an image larger than the actual object?

a) When the object is kept at a distance equal to its radius of curvature

b) When object is kept at a distance less than its focal length

c) When object is placed between the focus and centre of curvature

d) When object is kept at a distance greater than its radius of curvature