Lens Formula and Magnification MCQs
Practice Lens Formula and Magnification multiple-choice questions from Light - Reflection and Refraction (Class 10 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Lens Formula and MagnificationQuiz - Solve & Score
Q1. Which one of the following materials CANNOT be used to make a lens?
- A.Clay
- B.Glass
- C.Water
- D.Plastic
Answer: A. Clay
Q2. What is cataract?
- A.A condition where the crystalline lens of the eye becomes milky and cloudy.
- B.A condition where the eye loses its power of accommodation.
- C.A condition where the eye becomes blind.
- D.A condition where the eye becomes normal.
Answer: A. A condition where the crystalline lens of the eye becomes milky and cloudy.
NCERT fact (physics, chapter 'Light - Reflection and Refraction'): A condition where the crystalline lens of the eye becomes milky and cloudy. Why option A fits - Sometimes, the crystalline lens of people at old age becomes milky and cloudy. Distractor analysis: option B) 'A condition where the eye loses its power of accommodation.' fails since Presbyopia is a condition where the eye loses its power of accommodation; option C) 'A condition where the eye becomes blind.' doesn't hold - Cataract causes partial or complete loss of vision. Final answer - A) A condition where the crystalline lens of the eye becomes milky and cloudy.
Q3. A student has difficulty reading his textbook (held close) but can clearly read the blackboard from the last row. Which defect of vision does he have?
- A.Hypermetropia (far-sightedness)
- B.Myopia (near-sightedness)
- C.Presbyopia
- D.Astigmatism
Answer: A. Hypermetropia (far-sightedness)
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