Attempt any 22 (twenty two) short question from Question 2,3 and 4, at least 8 short questions from question 2, 8 short question from question 3 and 6 short question from question 4. All question carry equal marks.
Q.No. 2 Write answers of any EIGHT questions. Why is a convex lens of small focal length preferred for magnifying glass?
(8x2-16)
How the power is lost in optical fiber through dispersion?
Explain why the lenses used in expansive optical devices are composed of more than one part? How can a real image be distinguished from a virtual image? Can each type of image be projected on a screen?
Explain
Under what conditions does a convex lens act a diverging lens? Why does a diamond sparkle more than a glass imitation of the same shape and size? When two polarizes is placed in front of an unpolarized light ray. Then how is it possible to get minimum possible
Intensity of light? villy Why do we use photodiode to transmit T.V. signal through optical fiber?
Give the losses of power in fiber?
What are advantages of fiber optics?
What are three parts of spectrometer and give their function?
xii). How the power is lost in the optical fiber through dispersion?
Q.No.
3 Write answers of any EIGHT questions. How the light signal is transmitted through the fiber?
(8x2=16)
Draw sketches showing different path through a single mode and multi-mode fiber. Why a single mode fiber
preferred in telecommunications?
Hy a magnify glass gives five time enlarged image at the distance of 25cm from the lens. Find by the ray diagram
the focal length of lens.
If a person looking through microscope at the full moon, how would the appearance of moon be changed by Describe with the help of diagram, how (a) a single biconvex lens can be used as a magnily glass (b) biconvex
covering half of objective lens?
lens can be arranged to form microscope. vi) One can buy cheap microscope for use of children. The Images seen in such microscope have colored edges, why
is this so
vii) What is the effect on the image, if half of a converging lens is covered?
vin Explain the difference between the angular magnification and resolving power of the optical instrument. What
limits the magnification of an optical instrument? What do you understand by linear magnification and angular magnification? Explain how a convex lens is used
as a magnifier?
What are main defects of lens?.
if the focal length of the convex lens is 100cm then find it power?
x) What is the function of 'repeaters" in transmission of signal through optical fiber? Q.No. 4 Write answers of any SIX questions.
16x2 12)
17 What is meant by critical angle? Calculate the critical angle for water? U) Make a comparison between fiber optic and copper wires for best use?
1) M Write some uses of a spectrometer?
What is meant by normal adjustment for compound microscope?
Why we can't use red light with compound microscope? vij How can we express the resolving power of grating?
When light enters glass from air, its speed becomes less, it is due to change in its frequency or wavelength?
Show why a pinhole placed in front of lens leads to good image even if the image is not quite in focus?
How digital modulation is expressed?
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