NEET Physics: Ray Optics — MCQ Test 16

Q6. An object is placed \( 18 \, \text{cm} \) from a convex mirror of focal length \( 12 \, \text{cm} \). What is the image distance?

Q7. A double convex lens of refractive index \( 1.5 \) has radii of curvature \( 18 \, \text{cm} \) and \( -18 \, \text{cm} \). What is its focal length?

Q8. A lens has a power of \( +3 \, \text{D} \). What is its focal length in centimeters?

Q9. A converging beam meets a convex lens (\( f = 20 \, \text{cm} \)) \( 8 \, \text{cm} \) before the convergence point. What is the new image distance?

Q10. A simple microscope uses a lens of focal length \( 8 \, \text{cm} \). What is the magnification when the image is at infinity?

NEET Physics — Ray Optics

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In optical fibers, what ensures that light remains confined within the core during transmission?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Ray Optics. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Confined, Transmission, Critical, Interface, Telescope, and Objective.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. In optical fibers, what ensures that light remains confined within the core during transmission?

  • A. Absorption by the cladding
  • B. Refraction into the cladding
  • C. Higher refractive index of core than cladding
  • D. Lower refractive index of core than cladding

Q2. What is the critical angle for a crown glass (\( n = 1.52 \)) to air interface?

  • A. 41°
  • B. 45°
  • C. 50°
  • D. 35°

Q3. A telescope has an objective of focal length \( 120 \, \text{cm} \) and an eyepiece of focal length \( 6 \, \text{cm} \). What is its magnifying power?

  • A. 15
  • B. 18
  • C. 20
  • D. 25

Q4. A double convex lens has radii of curvature \( 30 \, \text{cm} \) and \( -30 \, \text{cm} \) with refractive index \( 1.6 \). What is its focal length?

  • A. 20 cm
  • B. 25 cm
  • C. 30 cm
  • D. 35 cm

Q5. Why is the image formed by a plane mirror always virtual?

  • A. Due to light converging in front of the mirror
  • B. Due to apparent divergence from behind the mirror
  • C. Due to the mirror’s curvature
  • D. Due to dispersion of light

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