Question Paper
Class / Subject: Class 10 (ICSE) · Physics
Chapter: Chapter 5 — Chapter 5: Refraction through a Lens
Time Allowed: 32 minutes
Max Marks: 16
1. What is the lens formula? [1]
(A) 1/v - 1/u = 1/f
(B) 1/v + 1/u = 1/f
(C) v-u=f
(D) v+u=f
2. What does a convex lens do to light? [1]
(A) Converges it
(B) Diverges it
(C) Blocks it
(D) Absorbs it
3. What does a concave lens do to light? [1]
(A) Diverges it
(B) Converges it
(C) Blocks it
(D) Absorbs it
4. What type of image does a concave lens always form? [1]
(A) Virtual, diminished, upright
(B) Real, magnified, inverted
(C) Real, diminished, upright
(D) Virtual, magnified, inverted
5. What condition does a concave lens correct? [1]
(A) Myopia (short-sightedness)
(B) Hypermetropia (long-sightedness)
(C) Colour blindness
(D) Astigmatism only
6. What is the magnification formula? [1]
(A) m = v/u
(B) m = u/v
(C) m = v+u
(D) m = v-u
7. Where are convex lenses used? [1]
(A) Magnifying glasses and cameras
(B) Only in myopia correction
(C) Nowhere practical
(D) Only in telescopes
8. Why learn about lenses? [1]
(A) To understand image formation and optical devices
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is the lens formula? [1]
(A) 1/v - 1/u = 1/f
(B) 1/v + 1/u = 1/f
(C) v-u=f
(D) v+u=f
10. What does a convex lens do to light? [1]
(A) Converges it
(B) Diverges it
(C) Blocks it
(D) Absorbs it
11. What does a concave lens do to light? [1]
(A) Diverges it
(B) Converges it
(C) Blocks it
(D) Absorbs it
12. What type of image does a concave lens always form? [1]
(A) Virtual, diminished, upright
(B) Real, magnified, inverted
(C) Real, diminished, upright
(D) Virtual, magnified, inverted
13. What condition does a concave lens correct? [1]
(A) Myopia (short-sightedness)
(B) Hypermetropia (long-sightedness)
(C) Colour blindness
(D) Astigmatism only
14. What is the magnification formula? [1]
(A) m = v/u
(B) m = u/v
(C) m = v+u
(D) m = v-u
15. Where are convex lenses used? [1]
(A) Magnifying glasses and cameras
(B) Only in myopia correction
(C) Nowhere practical
(D) Only in telescopes
16. Why learn about lenses? [1]
(A) To understand image formation and optical devices
(B) No reason
(C) It's not useful
(D) Only for tests