Reflection and Refraction of light class 10 notes

Light reflection and refraction

Reflection and refraction of light class 10 notes MCQ’s- Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. The reflected ray is always in the plane defined by the incident ray and the normal to the surface

MCQ’S ON reflection and refraction of light

1. Which one of the following materials cannot be used to make a lens?

(a) Water

(b) Glass

(c) Plastic

(d) Clay

2. Where should an object is placed in front of a convex lens to get a real image of the size of the object?

(a) At the principal focus of the lens

(b) At twice the focal length

(c) At infinity

(d) Between the optical centre of the lens and its principal focus.

3. A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be

(a) both concave.

(b) both convex.

(c) the mirror is concave and the lens is convex.

(d) the mirror is convex, but the lens is concave.

4. An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be

(a) 0.25 m

(b) 1.0 m

(c) 0.5 m

(d) 0.125 m

5. The angle of incidence for a ray of light having zero reflection angle is

(a) 0

(b) 30°

(c) 45°

(d) 90°

6. For a real object, which of the following can produce a real image?

(a) Plane mirror

(b) Concave mirror

(c) Concave lens

(d) Convex mirror

7. The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be

(a) at the focus

(b) at the centre of curvature

(c) between focus and centre of curvature

(d) beyond centre of curvature

8. The refractive index of water is 1.33. The speed of light in water will be

(a) 1.33 × 108 m/s

(b) 3 × 108 m/s

(c) 2.26 × 108 m/s

(d) 2.66 × 108 m/s

9. You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is

(a) A

(b) B

(c) C

(d) equal in all three media

10. When object moves closer to convex lens, the image formed by it shift

(a) away from the lens

(b) towards the lens

(c) first towards and then away from the lens

(d) first away and then towards the lens

11. A magnified real image is formed by a convex lens when the object is at

(a) F

(b) between F and 2F

(c) 2F

(d) only (a) and (b) both

12. Which of the following statements is/are 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 having a focal 0.25 m

13. 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.

14. In torches, search lights and headlights of vehicles

(a) between the pole and the focus of the reflector the bulb is placed

(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

15. 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