RAY OPTICS (IMP QUESTIONS)

1. SMART WORK FOR GREAT
SUCCESS
PRESENTED
BY
SHIRISHA
REDDYMALLA

2. RAY OPTICS AND OPTICAL
INSTRUMENTS
LONG ASNWER QUESTIONS (8
MARKS ) IMP
(a) Define Snell’s law. Using a neat labelled diagram derive an expression
for the refractive index of the material of an equilateral prism?
(b)A ray of light, after passing through the medium, meets the surface
separating the medium from air at an angle of 450 and is just not refracted.
What is the refractive index of the medium?
Draw a neat labelled diagram of a compound microscope and explain its
working. Derive an expression for its magnification?
Obtain an expression for the combined focal length for two thin convex
lenses kept in a contact and hence obtain an expression for the combined
power of the combination of lenses?

3. SHORT ANSWR QUESTIONS(4 M)
• Define critical angle. Explain total internal reflection using a neat diagram?
• Explain the formation of a RAINBOW?
• With a neat labelled diagram explain the formation of image in a simple
microscope?
• Explain the of mirage?
• Why does the setting sun appear red?
• Define focal length of concave mirror. Prove that the radius of curvature of a
concave mirror is double its focal length?
• Explain the cartesian sign convection for mirrors?

4. VERY SHORT ANWER QUESTIONS(2M)
Define “power” of convex lens. What is its unit?
What is dispersion? Which colour gets relatively more dispersed?
What is myopia? How it is corrected?
What is hypermetropia? How can it be corrected?
A small angled prism 40 deviates a ray through 2.480 .Find the refractive index of the
prism?
Define focal length and radius of curvature of a concave lens?
What is optical density and how it is different from mass density ?
What are the laws of reflection through curved mirrors?