Lenses (Concave and Convex) MCQs
Practice Lenses (Concave and Convex) 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.
Lenses (Concave and Convex)Quiz - Solve & Score
Q1. Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
- A.A convex lens of focal length 50 cm
- B.A concave lens of focal length 50 cm
- C.A convex lens of focal length 5 cm
- D.A concave lens of focal length 5 cm
Answer: C. A convex lens of focal length 5 cm
Eliminate first - option A) 'A convex lens of focal length 50 cm' fails since This lens is too weak for reading small letters; option B) 'A concave lens of focal length 50 cm' fails since This lens is too weak for reading small letters; option D) 'A concave lens of focal length 5 cm' misses the point - This lens is too weak for reading small letters. That leaves only option C). Confirm with the chapter rule: A convex lens of focal length 5 cm (physics, chapter 'Light - Reflection and Refraction'). Answer: C) A convex lens of focal length 5 cm.
Q2. Which lens is used in a simple microscope?
- A.concave lens
- B.concave mirror
- C.plane glass
- D.convex lens
Answer: D. convex lens
Q3. Where does the principal focus of a convex mirror lie?
- A.Behind the mirror (it is a virtual focus)
- B.In front of the mirror
- C.At the pole of the mirror
- D.At the centre of curvature
Answer: A. Behind the mirror (it is a virtual focus)
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