Page 37 - 10-phy-12 Geometrical Optics

12. geometrical Optics eLearn.Punjab

12.6 What is meant by refractive index of a material? How would you determine the refractive
index of a rectangular glass slab?

12.7 State the laws of refraction of light and show how they may be verified using rectangular
glass slab and pins.
12.8
12.9 What is meant by the term total internal reflection?
12.10
State the conditions for total internal reflection.
12.11 What is critical angle? Derive a relationship between the critical angle and the refractive
index of a substance.
12.12
What are optical fibres? Describe how total internal reflection is used in light propagating
through optical fibres.
Define the following terms applied to a lens:
(i) principal axis (ii) optical centre (iii) focal length

12.13 What is meant by the principal focus of a (a) convex lens (b) concave lens? Illustrate your
answer with ray diagrams.
12.14
12.15 Describe how light is refracted through convex lens.

12.16 With the help of a ray diagram, how can you show the use of thin converging lens as a
magnifying glass.
12.17 A coin is placed at a focal point of a converging lens. Is an image formed? What is its
12.18 nature?

12.19 What are the differences between real and virtual images?
12.20
12.21 How does a converging lens form a virtual image of a real object? How does a diverging
12.22 lens form a real image of a real object?
Define power of a lens and its units.
12.23
Describe the passage of light through a glass prism and measure the angle of deviation.
12.24
12.25 Define the terms resolving power and magnifying power.
Draw the ray diagrams of
(i) simple microscope (ii) compound microscope (iii) refracting telescope
Mention the magnifying powers of the following optical instruments:
(i) simple microscope (ii) compound microscope (iii) refracting telescope
Draw ray diagrams to show the formation of images in the normal human eye.

What is meant by the terms nearsightedness and farsightedness? How can these defects
be corrected?

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