Class 10 Science Light – Reflection and Refraction

Class 10 Science Light – Reflection and Refraction

Class 10 Science Light – Reflection and Refraction Fill in the blanks , Multiple Choice Question [mcq] and True false .

 

Fill in the Blanks

 

1. Light travels in __________ lines.Answer: straight

2. The angle of incidence is always __________ to the angle of reflection. Answer: equal

3. A concave mirror converges light rays to a point called the __________. Answer: principal focus

4. The focal length (f) of a spherical mirror is half of its __________. Answer: radius of curvature

5. A convex mirror always forms a __________ and diminished image. Answer: virtual

6. The mirror formula is given by __________. Answer: \(\frac{1}{v} + \frac{1}{u} = \frac{1}{f}\)

7. Refraction occurs when light passes from one __________ medium to another. Answer: transparent

8. The refractive index of water is __________. Answer: 1.33

9. A convex lens is also called a __________ lens. Answer: converging

10. The power of a lens is measured in __________. Answer: dioptres

11. A concave lens always forms a __________ image. Answer: virtual

12. The speed of light is maximum in __________. Answer: vacuum

13. A real image is always __________. Answer: inverted

14. The SI unit of power of a lens is __________. Answer: dioptre (D)

Multiple Choice Questions (MCQs)

1. Which mirror is used as a rear-view mirror in vehicles?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) None of these
Answer: (c) Convex mirror

 

2. The focal length of a convex mirror is 20 cm. Its radius of curvature is:
(a) 10 cm
(b) 20 cm
(c) 40 cm
(d) 5 cm
Answer: (c) 40 cm

 

3. A concave mirror forms a real, inverted, and enlarged image when the object is placed:
(a) At F
(b) Between F and C
(c) Beyond C
(d) At C
Answer: (b) Between F and C

 

4. The refractive index of diamond is:
(a) 1.33
(b) 1.50
(c) 2.42
(d) 1.00
Answer: (c) 2.42

 

5. Which lens is used to correct myopia?
(a) Convex lens
(b) Concave lens
(c) Plane lens
(d) Bifocal lens
Answer: (b) Concave lens

 

6. The power of a lens with a focal length of 50 cm is:
(a) +2 D
(b) -2 D
(c) +0.5 D
(d) -0.5 D
Answer: (a) +2 D

 

7. A virtual image is formed by:
(a) Only concave mirrors
(b) Only convex mirrors
(c) Both concave and convex mirrors
(d) Plane mirrors only
Answer: (c) Both concave and convex mirrors

 

8. The bending of light when it passes from one medium to another is called:
(a) Reflection
(b) Refraction
(c) Diffraction
(d) Dispersion
Answer: (b) Refraction

 

9. The speed of light is maximum in:
(a) Glass
(b) Water
(c) Air
(d) Vacuum
Answer: (d) Vacuum

 

10. The magnification produced by a plane mirror is:
(a) +1
(b) -1
(c) 0
(d) Infinity
Answer: (a) +1

 

11. Which mirror is used in solar furnaces?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) None of these
Answer: (b) Concave mirror

 

12. The focal length of a concave lens is always:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Answer: (b) Negative

 

13. The image formed by a convex lens when the object is placed between F and 2F is:
(a) Real and inverted
(b) Virtual and erect
(c) Highly diminished
(d) Laterally inverted
Answer: (a) Real and inverted

 

14. The phenomenon of light bending around obstacles is called:
(a) Refraction
(b) Reflection
(c) Diffraction
(d) Dispersion
Answer: (c) Diffraction

 

Class 10 Science Light – Reflection and Refraction True or False

 

1. Light travels faster in water than in air. Answer: False

2. A convex mirror always forms a virtual image. Answer: True

3. The focal length of a concave mirror is negative. Answer: False

4. Refractive index has no unit. Answer: True

5. A concave lens is a diverging lens. Answer: True

6. The image formed by a plane mirror is always real. Answer: False

7. The principal focus of a convex mirror lies behind the mirror. Answer: True

8. Snell’s law relates the angle of incidence to the angle of reflection. Answer: False

9. The magnification of a concave mirror can be greater than 1. Answer: True

10. A convex lens can form both real and virtual images. Answer: True

11. The power of a convex lens is negative. Answer: False

12. A concave mirror is used in torches and headlights. Answer: True

13. Light bends towards the normal when it passes from air to glass. Answer: True

14. The focal length of a lens depends on the material of the lens. Answer: True

15. A virtual image cannot be obtained on a screen. Answer: True