Power of a LensPractice Questions & MCQs
Practice Power of a Lens questions from Light - Reflection and Refraction (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Power of a LensQuiz - Solve & Score
Q1. A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
- A.i) 0.18 m, ii) 0.67 m
- B.i) 0.18 m, ii) 0.67 cm
- C.i) 0.18 cm, ii) 0.67 m
- D.i) 0.67 m, ii) 0.18 m
Answer: A. i) 0.18 m, ii) 0.67 m
Q2. A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
- A.The focal length is 66.67 cm and the lens is converging
- B.The focal length is 33.33 cm and the lens is converging
- C.The focal length is 66.67 cm and the lens is diverging
- D.The focal length is 33.33 cm and the lens is diverging
Answer: A. The focal length is 66.67 cm and the lens is converging
First, read what's there - a typical physics numerical. The data on the table: 1.5. We are after Find the focal length of the lens. Pick the chapter relation that contains every given quantity and the unknown; rearrange for the unknown. Common-sense check: The focal length is 66.67 cm and the lens is converging. Lock in option A) The focal length is 66.67 cm and the lens is converging. Trap-watch: option B) 'The focal length is 33.33 cm and the lens is converging' is wrong because This is not the correct solution; option C) 'The focal length is 66.67 cm and the lens is diverging' is wrong because This is not the correct solution.
Q3. A person cannot see nearby objects clearly (hypermetropia). Which type of lens is used in spectacles to correct this defect?
- A.A convex (convergent) lens
- B.A concave (divergent) lens
- C.A cylindrical lens
- D.A plane mirror
Answer: A. A convex (convergent) lens
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Where can I practise Power of a Lens questions for Class 10 Science?
RankByte has Power of a Lens practice questions and MCQs from Light - Reflection and Refraction (Class 10 Science), each with the correct answer and a step-by-step solution - free to start.
Are these Power of a Lens questions important for the exam?
Yes. These Power of a Lens important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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