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Andhra Pradesh SSC (Class 10) Refraction of Light and Lenses — practice questions

Explore 63 free Refraction of Light and Lenses questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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Refraction of Light and Lenses questions and exercises with answers

Showing questions 1–30 of 63.

Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination isRead the answer and worked solution →A 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. The focal length of the mirror isRead the answer and worked solution →The refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)Read the answer and worked solution →The magnification produced by a plane mirror isRead the answer and worked solution →A convex lens has power +4 D. Its focal length isRead the answer and worked solution →An object is placed at the centre of curvature of a concave mirror. The image formed isRead the answer and worked solution →A convex lens forms a real image three times the size of the object on a screen. If the focal length is 20 cm, the object distance isRead the answer and worked solution →The laws of reflection hold good forRead the answer and worked solution →A ray of light travelling in air enters water (n = 4/3). It bendsRead the answer and worked solution →An object 4 cm tall is placed 15 cm from a convex lens of focal length 10 cm. The image height isRead the answer and worked solution →A small bulb is placed at the focus of a concave mirror of focal length 12 cm. The reflected beam isRead the answer and worked solution →The power of a lens is −2.5 D. The lens isRead the answer and worked solution →For a concave mirror, as an object moves from infinity towards the focus, the real imageRead the answer and worked solution →According to the law of reflection, the angle of incidence is equal to the:Read the answer and worked solution →A concave mirror is also known as a:Read the answer and worked solution →A convex mirror is also known as a:Read the answer and worked solution →The image formed by a plane mirror is:Read the answer and worked solution →The bending of light as it passes from one transparent medium into another is called:Read the answer and worked solution →A convex lens is a:Read the answer and worked solution →A concave lens is a:Read the answer and worked solution →The distance between the pole and the principal focus of a spherical mirror is called the:Read the answer and worked solution →For a spherical mirror, the focal length f and radius of curvature R are related by:Read the answer and worked solution →The type of mirror used as a rear-view (wing) mirror in vehicles is a:Read the answer and worked solution →A concave mirror is used by dentists and for shaving because it can form a:Read the answer and worked solution →The refractive index of a medium compares the speed of light in:Read the answer and worked solution →Light is assumed, in this chapter, to travel in:Read the answer and worked solution →As per your syllabus, what is FOCAL LENGTH (f) of a spherical mirror?Read the answer and worked solution →As per your syllabus, when light enters a DENSER medium from a rarer one (e.g. air to glass), how does it bend?Read the answer and worked solution →As per your syllabus, what is the speed of light in a VACUUM?Read the answer and worked solution →As per your syllabus, what is the refractive index of WATER?Read the answer and worked solution →

Worked practice questions

Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination is

  1. 50 cm
  2. −33.3 cm
  3. 33.3 cm
  4. 20 cm
Show answer and solution

Correct answer: C. 33.3 cm

Powers add in contact: $P=+5-2=+3$ D. $f=1/P=1/3\,\text{m}=33.3$ cm (converging).

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A 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. The focal length of the mirror is

  1. 30 cm
  2. 10 cm
  3. 15 cm
  4. 20 cm
Show answer and solution

Correct answer: D. 20 cm

$m=h'/h=-5/10=-0.5=-v/u$ with $v=-30$, so $u=-60$ cm. $\frac1f=\frac1v+\frac1u=-\frac1{30}-\frac1{60}=-\frac{3}{60}\Rightarrow f=-20$ cm. Magnitude 20 cm.

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The refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)

  1. $4.5 \times 10^8$ m/s
  2. $3 \times 10^8$ m/s
  3. $2 \times 10^8$ m/s
  4. $1.5 \times 10^8$ m/s
Show answer and solution

Correct answer: C. $2 \times 10^8$ m/s

$n=c/v \Rightarrow v=c/n=(3\times10^8)/1.5=2\times10^8$ m/s.

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