Ray-Optics Theoretical Important Questions in Physics for Class-XII Pdf Download

Obtain crucial theoretical questions on Ray Optics for Class-12 Physics. Get the PDF download now to enhance your exam preparation and excel in your studies!

Chapter 9: Ray Optics and Optical Instruments

  • Ray Optics:-
  • Reflection of light.
  • Spherical Mirrors.
  • Mirror formula.
  • Reflection of Light.
  • Total internal Reflection And Its Applications.
  • Optical Fibres.
  • Refraction at Spherical Surfaces
  • Lenses.
  • Thin lense formula
  • Lens Maker formula.
  • Magnification power of a Lens, Combination of thin lenses in contact, Combination of lenses and mirror.
  • Refraction and dispersion of light through a prism.
  • Scattering of light- blue colour of sky and reddish appearance of the sun at sunrise and sunset.
  • Optical instrument. Microscope and astronomical telescope and their magnifying power.

Ray-Optics

1. Derive mirror formula for a concave mirror and convex mirror.

2. Derive an expression for lateral shift and normal shift. On what factors thesedepend.

3. Define Total internal reflection and write the conditions for TIR. Derive a relation

between criticalangle and the refractive index of the medium. Also explain the working

ofisosceles prism and optical fiber.

4. Derive the following relation for a real image formed by a convex refractingsurface when

the object is placed in rarer medium. Also write the assumptions andsign convention

used.

5. Derive the lens maker’s formula. Also write the assumptions and sign conventionused.

6. Derive the lens formula for convex lens and concave lens.

7. Derive the relation for equivalent focal length or power when two thin lenses areplaced

in contact to each other. In which condition the lens combination will act asa plane glass

sheet.

8. Derive the following relations for a prismWhere the symbols have their usual meanings.

9. Draw a ray diagram to show the image formation in refracting type

astronomicaltelescope in the near point adjustment (when image is formed at LDDV

i.eD=25cm). Derive an expression for its magnifying power. Why the diameter

ofobjective of telescope should be large.

10. Draw a ray diagram to show the image formation in refracting type astronomical

telescope in the normal adjustment (when image is formed at infinity). Derive an

expression for its magnifying power. How does the magnifying power get affected on

increasing the aperture of the objective lens and why?

11. Draw a ray diagram to show the image formation a compound microscope. Explain

briefly the working. Derive an expression for its magnifying power. Why the diameter of

objective of microscope should be small.

12. Draw a labeled diagram of a reflecting type telescope. State two advantages of this

telescope over refracting type telescope.

13. Define resolving power of compound microscope. How does the resolving power of a

compound microscope change when-

(a) Refractive index of medium between the object and objective lens increases

(b) Wavelength of the light used is increased

(c) Decreasing the diameter of objective

(d) Increasing the focal length of its objective.

14. Define the resolving power of astronomical telescope. Write the expression for it and

state, on what factors it depends.


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