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Ray Optics & Instruments
NEET Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
The mirror formula is:
- A. 1/v + 1/u = f
- B. 1/v + 1/u = 1/f
- C. 1/v - 1/u = 1/f
- D. v + u = f
Q2
The lens maker's equation for a thin lens with radii R₁ and R₂ is:
- A. 1/f = (n-1)(1/R₁ - 1/R₂)
- B. 1/f = n(1/R₁ + 1/R₂)
- C. f = (n-1)/R
- D. f = R₁R₂/(n-1)
Q3
A concave mirror always forms a virtual image when an object is placed:
- A. Beyond centre of curvature
- B. Between focus and pole
- C. At the focus
- D. At the centre of curvature
Q4
Total internal reflection occurs when light travels from:
- A. Rare to dense medium
- B. Dense to rare medium, beyond critical angle
- C. Any medium to vacuum
- D. Dense to rare at any angle
Q5
The magnifying power of a simple microscope with focal length f at near point D is:
- A. D/f
- B. 1 + D/f
- C. f/D
- D. D × f
Q6
A convex lens of focal length f₁ and concave lens of focal length f₂ are in contact. The combination has focal length:
- A. f₁ + f₂
- B. f₁f₂/(f₁-f₂)
- C. f₁f₂/(f₁+f₂)
- D. f₁ - f₂
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