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Andhra Pradesh SSC (Class 10) Refraction through a Lens — practice questions

Explore 30 free Refraction through a Lens 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 through a Lens questions and exercises with answers

Showing questions 1–30 of 30.

Match lens setups to the image formedRead the answer and worked solution →A convex lens is also called a:Read the answer and worked solution →The focal length of a concave lens is taken to be:Read the answer and worked solution →Power of a lens has the SI unit:Read the answer and worked solution →An object placed at 2F from a convex lens forms an image:Read the answer and worked solution →A concave lens always forms an image that is:Read the answer and worked solution →Power of a convex lens of focal length 50 cm is:Read the answer and worked solution →Magnification produced by a lens is given by:Read the answer and worked solution →An object placed at the focal point of a convex lens produces image:Read the answer and worked solution →For a convex lens, when the object is between F and 2F, the image is:Read the answer and worked solution →A convex lens is used as a magnifying glass. The object is placed:Read the answer and worked solution →Image distance v = +30 cm and object distance u = -10 cm. Magnification is:Read the answer and worked solution →An object 4 cm tall is placed 12 cm from a convex lens of focal length 8 cm. The image is:Read the answer and worked solution →Two thin lenses of focal lengths +20 cm and +25 cm are placed in contact. Power of combination:Read the answer and worked solution →A magnifying glass works best when the object is at:Read the answer and worked solution →If a convex lens is half covered with black paper, the image formed is:Read the answer and worked solution →A lens is held in water. Its focal length compared with that in air:Read the answer and worked solution →A real image of magnification 2 is formed by a convex lens of focal length 10 cm. Object distance is:Read the answer and worked solution →Power of a concave lens is:Read the answer and worked solution →An equiconvex thin lens has both surfaces of curvature 20 cm and refractive index 1.5. Its focal length is:Read the answer and worked solution →A real image of an object can be formed by:Read the answer and worked solution →If the focal length of a convex lens is doubled, its power:Read the answer and worked solution →Which is the principal use of a concave lens?Read the answer and worked solution →An object is placed beyond 2F from a convex lens. Image position is:Read the answer and worked solution →If both surfaces of a thin lens have equal radii of curvature R, the lens is called:Read the answer and worked solution →Image formed by a convex lens with object at infinity is:Read the answer and worked solution →A virtual image:Read the answer and worked solution →Two lenses of powers +3 D and -5 D are placed in contact. The combination:Read the answer and worked solution →Cross-section of a convex lens looks like:Read the answer and worked solution →Linear magnification produced by a converging lens for an object at 2F is:Read the answer and worked solution →

Worked practice questions

Match lens setups to the image formed

Read exercise and reference answers
Matching pairs
  1. Left
    Convex lens (object beyond 2F)
    Right
    Real, inverted, diminished
  2. Left
    Convex lens (object between F and 2F)
    Right
    Real, inverted, magnified
  3. Left
    Convex lens (object within F)
    Right
    Virtual, erect, magnified
Instructions
Tap a lens with its object position, then tap the kind of image that setup makes.

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A convex lens is also called a:

  1. Converging lens
  2. Diverging lens
  3. Flat lens
  4. Mirror lens
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Correct answer: A. Converging lens

1. A convex lens is thicker in the middle. 2. Parallel rays after passing through it converge to a real focus. 3. Hence it is called a converging lens. 4. A concave lens diverges rays. _Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_

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The focal length of a concave lens is taken to be:

  1. Positive
  2. Negative
  3. Zero
  4. Imaginary
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Correct answer: B. Negative

1. Concave lens has a virtual focus on the same side as the object. 2. By sign convention, focal length on the incoming-light side is negative. 3. So a concave lens has negative focal length. 4. A convex lens has positive focal length. _Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_

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