NEET Physics Ray Optics : Multiple Choice Previous Years Questions MCQs 4 | Summary and Q&A

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November 1, 2017
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NEET Physics Ray Optics : Multiple Choice Previous Years Questions MCQs 4

TL;DR

This video explains ray optics and how to use lens formulas to calculate focal length and power of lenses.

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Key Insights

  • 🪩 Real images can only be formed with concave mirrors, while convex mirrors produce virtual and diminished images.
  • 🫰 The condition for dispersion without deviation in prism setups is given by a/a- = (μ - 1)/(ν - 1), where a is the angle of the first prism and μ and ν are the refractive indices of the prisms.
  • 👻 The lens maker's formula, 1/F = (μ - 1)(1/R1 - 1/R2), allows for the calculation of the radii of curvature of a converging lens.
  • 🪩 Total deviation produced by two plane mirrors at right angles is given by Δ = 360° - 2θ, where θ is the angle between the mirrors.

Transcript

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Questions & Answers

Q: How do you determine the type of mirror needed to form a real image?

To form a real image, a concave mirror is needed, as convex mirrors always produce virtual and diminished images.

Q: What is the condition for dispersion without deviation in a prism setup?

For dispersion without deviation, the relationship between the angle of prisms and refractive index is given by a/a- = (μ - 1)/(ν - 1), where a is the angle of the first prism and μ and ν are the refractive indices of the prisms.

Q: How can you calculate the radii of curvature of a converging lens?

Using the lens maker's formula, 1/F = (μ - 1)(1/R1 - 1/R2), where F is the focal length, μ is the refractive index, R1 is the radius of curvature for one surface, and R2 is the radius of curvature for the other surface.

Q: How is total deviation determined in a setup with two plane mirrors at right angles?

The total deviation produced by two plane mirrors is given by Δ = 360° - 2θ, where θ is the angle between the two mirrors.

Summary & Key Takeaways

  • The video begins by explaining how to determine the type of mirror needed to form a real image, using the given values of object and image heights and distances.

  • It then demonstrates how to find the angle of a second prism when combined with the first prism to produce dispersion without deviation.

  • The video also provides a step-by-step process for calculating the radii of curvature of a converging lens based on its focal length and refractive index.

  • Finally, it explores the concept of total deviation produced by two plane mirrors at right angles and explains how to calculate it.

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