Refraction Through a Lens Quiz - ICSE Class 10 Physics

Free practice quiz: Refraction Through a Lens (ICSE Class 10 Physics). 44 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 10 Physics practice quiz has 44 multiple-choice questions on Refraction Through a Lens, and 44 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. An object is placed at the center of curvature of a convex lens. Where will the image be formed?

   1. At the principal focus
   2. Beyond the center of curvature
   3. At the center of curvature
   4. Between the optical center and the principal focus
   Show answer

   Answer: C. At the center of curvature

   When an object is placed at the center of curvature (2F) of a convex lens, the rays passing through the optical center go undeviated, and rays parallel to the principal axis pass through the principal focus after refraction. These refracted rays converge at the center of curvature on the other side of the lens. Therefore, the image is formed at the center of curvature, it is real, inverted, and of the same size.

2. An object is placed 50 cm from a convex lens of focal length 25 cm. The image formed is:

   1. Real, inverted, and diminished
   2. Virtual, erect, and magnified
   3. Real, inverted, and of the same size
   4. Real, inverted, and magnified
   Show answer

   Answer: C. Real, inverted, and of the same size

   The object is placed at 50 cm from a convex lens with a focal length of 25 cm. This means the object is placed at 2F (twice the focal length), which is also the center of curvature. When an object is placed at 2F of a convex lens, the image formed is real, inverted, and of the same size, and it is also formed at 2F on the other side of the lens.

3. A concave lens diverges parallel rays of light. This means it is also known as a:

   1. Converging lens
   2. Focusing lens
   3. Diverging lens
   4. Magnifying lens
   Show answer

   Answer: C. Diverging lens

   A concave lens causes parallel rays of light to spread out or diverge after passing through it. Therefore, it is called a diverging lens.

4. A beam of parallel light rays is incident on a convex lens. After refraction, the rays converge at:

   1. Infinity
   2. The optical center
   3. The principal focus
   4. A point beyond the principal focus
   Show answer

   Answer: C. The principal focus

   By the definition of a convex lens, incident rays that are parallel to the principal axis converge at the principal focus (F) after refraction through the lens.

5. An object is placed at infinity in front of a concave lens. Where is the image formed?

   1. At the optical center
   2. At the principal focus
   3. At twice the focal length
   4. Beyond twice the focal length
   Show answer

   Answer: B. At the principal focus

   When an object is placed at infinity in front of a concave lens, the rays incident on the lens are parallel. After refraction, these parallel rays diverge in such a way that they appear to originate from the principal focus (F) on the same side of the lens as the object. Thus, a virtual, erect, and highly diminished image is formed at the principal focus.

More questions in this quiz

Answers and explanations are in the full quiz.

1. A ray of light passes through the optical center of a convex lens. What happens to the ray after refraction?
2. If the focal length of a concave lens is 30 cm, what is the power of the lens?
3. A convex lens forms a real, inverted image of the same size as the object. At what position is the object placed with respect to the lens?
4. Which of the following statements is TRUE for a concave lens?
5. The image formed by a convex lens is virtual, erect, and magnified. Where is the object placed?
6. A lens has a focal length of -25 cm. What type of lens is it, and what is its power?
7. When parallel rays of light are incident on a concave lens, they diverge after refraction as if they originated from a point on the principal axis. This point is called the:
8. If a lens converges parallel rays of light, it is a:
9. Which phenomenon is responsible for the formation of images by lenses?
10. A ray of light parallel to the principal axis of a convex lens passes through which point after refraction?
11. For a concave lens, if the object distance is 10 cm and the image distance is 5 cm, what is the focal length of the lens?
12. Which lens is used in a simple microscope to obtain a magnified, virtual, and erect image?
13. If the focal length of a lens is 0.5 m, what is its power?
14. An object is placed at infinity in front of a convex lens. Where is the image formed?
15. Which type of lens is thicker at the center and thinner at the edges?
16. If an object is placed at the focal point (F) of a convex lens, where will the image be formed?
17. What is the unit of power of a lens?
18. The lens used in myopia correction is:
19. What is the focal length of a lens with a power of +2.5 D?
20. A ray of light passes through the principal focus of a convex lens. What happens to the ray after refraction?
21. Which of the following lenses will diverge a beam of parallel light rays?
22. An object is placed 5 cm from a convex lens of focal length 10 cm. What is the nature and position of the image?
23. If the magnification of a lens is -0.5, what can you conclude about the image and the lens?
24. A concave lens has a focal length of 20 cm. An object is placed at 40 cm from the lens. Where is the image formed?
25. The combination of lenses used in a refracting telescope is typically:
26. A lens has a focal length of 10 cm. What is the object distance for which a real image of twice the size is formed?
27. A convex lens of focal length 25 cm is used to form a real image. If the object distance is 50 cm, where is the image formed?
28. Which of the following is a characteristic of a virtual image formed by a convex lens?
29. When is the image formed by a concave lens of the same size as the object?
30. The power of a convex lens is +5.0 D. What is its focal length?
31. A ray of light from a rarer medium enters a denser medium and bends towards the normal. This phenomenon is known as:
32. Which type of lens is used to correct hypermetropia (long-sightedness)?
33. What is the focal length of a lens with a power of -2.0 D?
34. A ray of light parallel to the principal axis of a concave lens passes through which point after refraction?
35. When is the magnification of a convex lens equal to -1?
36. The phenomenon of splitting of white light into its constituent colors when it passes through a prism is called:
37. If the focal length of a lens is +50 cm, what is its power?
38. A convex lens is used as a magnifying glass. For maximum magnification, the object should be placed:
39. Which of the following statements about lenses is INCORRECT?

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