Light – Reflection and Refraction

This chapter has

Light – Reflection and Refraction — solved practice questions

8 Class 10 Science questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   The law of reflection states that the angle of incidence equals:

   • Aangle of refraction
   • Bangle of reflection
   • C90°
   • Dtwice the angle of reflection
   Show answer & solution

   Correct answer: (B) angle of reflection

   The angle of incidence equals the angle of reflection (both measured from the normal).

2. Q2easy

   The image formed by a plane mirror is:

   • Avirtual, erect, same size
   • Breal, inverted, same size
   • Cvirtual, inverted, magnified
   • Dreal, erect, same size
   Show answer & solution

   Correct answer: (A) virtual, erect, same size

   A plane mirror forms a virtual, erect, laterally inverted image of the same size as the object.

3. Q3medium

   The focal length of a concave mirror is:

   • Aequal to radius of curvature
   • Bhalf the radius of curvature
   • Ctwice the radius of curvature
   • Dequal to the aperture
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   Correct answer: (B) half the radius of curvature

   The focal length f = R/2, where R is the radius of curvature.

4. Q4easy

   Which mirror is used as a rear-view mirror in vehicles?

   • Aplane mirror
   • Bconcave mirror
   • Cconvex mirror
   • Dcylindrical mirror
   Show answer & solution

   Correct answer: (C) convex mirror

   Convex mirrors are used as rear-view mirrors because they give a wider field of view and always form erect, diminished images.

5. Q5medium

   The mirror formula is:

   • A1/v + 1/u = 1/f
   • Bv + u = f
   • C1/f = 1/u − 1/v
   • Duv = f
   Show answer & solution

   Correct answer: (A) 1/v + 1/u = 1/f

   1/v + 1/u = 1/f, where u = object distance, v = image distance, f = focal length.

6. Q6easy

   The bending of light when it passes from one medium to another is called:

   • Areflection
   • Brefraction
   • Cdispersion
   • Ddiffraction
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   Correct answer: (B) refraction

   Refraction is the change in direction of light when it travels from one transparent medium to another.

7. Q7medium

   Snell's law states: n₁ sin i = n₂ sin r. Here 'i' is the angle of:

   • Aincidence
   • Breflection
   • Crefraction
   • Ddeviation
   Show answer & solution

   Correct answer: (A) incidence

   In Snell's law, i is the angle of incidence and r is the angle of refraction, both measured from the normal.

8. Q8medium

   The refractive index of a medium is greater than 1. This means light travels:

   • Afaster than in vacuum
   • Bslower than in vacuum
   • Cat the same speed
   • Dat right angles
   Show answer & solution

   Correct answer: (B) slower than in vacuum

   n = c/v > 1 → v < c → light travels slower in that medium than in vacuum.

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